diff --git a/scripts/test-variant-flow.js b/scripts/test-variant-flow.js
index b71ed8f..c69774e 100644
--- a/scripts/test-variant-flow.js
+++ b/scripts/test-variant-flow.js
@@ -116,6 +116,36 @@ async function run() {
     // Fathersort should have picked 0 (next free non-negative integer)
     assert.deepEqual(list.map((c) => c.fathersort), [0, 1]);
 
+    console.log('6. Testing rejecting sku when creating via addChild...');
+    await assert.rejects(
+      async () => {
+        await store.article.addChild(googleAuthId, father.sku, {
+          sku: 'SOME-CUSTOM-SKU',
+          value: 'Lila',
+        });
+      },
+      (err) => {
+        assert.match(err.message, /sku is not allowed when creating a child article/);
+        return true;
+      },
+      'Expected sku on addChild to be rejected'
+    );
+
+    console.log('7. Testing attaching existing orphan article (SKU-2) via attachChild...');
+    const reconnected = await store.article.attachChild(googleAuthId, father.sku, {
+      sku: child2.article.sku,
+      value: 'Blau',
+    });
+    assert.equal(reconnected.article.sku, child2.article.sku);
+    assert.equal(reconnected.article.fatherArticleId, father.id);
+
+    console.log('8. Testing idempotent attachChild on same father...');
+    const idempotentResult = await store.article.attachChild(googleAuthId, father.sku, {
+      sku: child2.article.sku,
+      value: 'Blau',
+    });
+    assert.equal(idempotentResult.article.sku, child2.article.sku);
+
     console.log('✅ ALL VARIANT FLOW TESTS PASSED');
   } finally {
     try {
diff --git a/src/index.js b/src/index.js
index 11dfc92..601146e 100644
--- a/src/index.js
+++ b/src/index.js
@@ -35,6 +35,7 @@ import articleSetCategoryIdsBySku from './store/article/setCategoryIdsBySku.js';
 import articleSetFatherBySku from './store/article/setFatherBySku.js';
 import articleToggleFather from './store/article/toggleFather.js';
 import articleAddChild from './store/article/addChild.js';
+import articleAttachChild from './store/article/attachChild.js';
 import articleRemoveChild from './store/article/removeChild.js';
 import articleListChildren from './store/article/listChildren.js';
 import articleImportRows from './store/article/importRows.js';
@@ -269,6 +270,7 @@ export default class LibDashStore {
       setFatherBySku: articleSetFatherBySku(provider),
       toggleFather: articleToggleFather(provider),
       addChild: articleAddChild(provider),
+      attachChild: articleAttachChild(provider),
       removeChild: articleRemoveChild(provider),
       listChildren: articleListChildren(provider),
       getArticlelist: articlelistGetItems(provider),
diff --git a/src/store/article/addChild.js b/src/store/article/addChild.js
index 1a16f46..8d592c6 100644
--- a/src/store/article/addChild.js
+++ b/src/store/article/addChild.js
@@ -16,11 +16,13 @@ import resolveArticleBySku from './resolveArticleBySku.js';
 import getBySku from './getBySku.js';
 import makeRunner from '../runner.js';
 import resolveUniqueSlug from './resolveUniqueSlug.js';
+import attachChild from './attachChild.js';
 
 export default function addChild(provider) {
   const resolve = resolveArticleBySku(provider);
   const load = getBySku(provider);
   const resolveSlug = resolveUniqueSlug(provider);
+  const attach = attachChild(provider);
   const isSqlite = provider?.dialect === 'sqlite3';
 
   const queries = isSqlite ? sqliteArticle : mssqlArticle;
@@ -32,11 +34,12 @@ export default function addChild(provider) {
   const insertHistorySql = isSqlite ? SQLITE_INSERT_HISTORY : MSSQL_INSERT_HISTORY;
 
   /**
-   * Adds a child article to a father article.
+   * Adds a child article to a father article (creates and attaches with auto-generated SKU).
    *
    * @param {number} googleAuthId - The id of the Google auth user.
    * @param {string} fatherSku - The father article SKU.
    * @param {object} options
+   * @param {boolean} [options.attach=false] - If true, attaches an existing article instead of creating.
    * @param {number} [options.attributeValueId] - Existing attribute value ID for father's attribute.
    * @param {string} [options.value] - String value to find or create under father's attribute.
    * @param {string} [options.name] - Custom name for child article (defaults to father name + value).
@@ -47,7 +50,15 @@ export default function addChild(provider) {
    * @returns {Promise<object>} The created child article detail.
    */
   return async (googleAuthId, fatherSku, options = {}, tx) => {
+    if (options.attach) {
+      return attach(googleAuthId, fatherSku, options, tx);
+    }
+
     const run = async (runner) => {
+      if (options.sku || options.childSku) {
+        throw new Error('sku is not allowed when creating a child article; omit sku to auto-generate or use PUT to attach an existing article');
+      }
+
       const { articleId: fatherId, companyId, languageId, companyuserId } = await resolve(
         googleAuthId,
         fatherSku,
@@ -131,40 +142,26 @@ export default function addChild(provider) {
         throw new Error('Variant with this attribute value already exists');
       }
 
-      // Compute child SKU:
-      // If options.sku is provided, use it.
-      // Otherwise, derive using next free index: fatherSku-1, fatherSku-2, ...
-      let childSku = (typeof options.sku === 'string' && options.sku.trim()) || null;
-      if (!childSku) {
-        const existingSkusRes = await runner.query(
-          'SELECT sku FROM article WHERE company_id = @companyId AND sku LIKE @prefix',
-          { companyId, prefix: `${father.sku}-%` },
-        );
-        const usedIndices = new Set();
-        const prefix = `${father.sku}-`;
-        for (const row of existingSkusRes.rows) {
-          if (row.sku && row.sku.startsWith(prefix)) {
-            const numPart = row.sku.slice(prefix.length);
-            if (/^\d+$/.test(numPart)) {
-              usedIndices.add(parseInt(numPart, 10));
-            }
+      // Compute child SKU using next free index: fatherSku-1, fatherSku-2, ...
+      const existingSkusRes = await runner.query(
+        'SELECT sku FROM article WHERE company_id = @companyId AND sku LIKE @prefix',
+        { companyId, prefix: `${father.sku}-%` },
+      );
+      const usedIndices = new Set();
+      const prefix = `${father.sku}-`;
+      for (const row of existingSkusRes.rows) {
+        if (row.sku && row.sku.startsWith(prefix)) {
+          const numPart = row.sku.slice(prefix.length);
+          if (/^\d+$/.test(numPart)) {
+            usedIndices.add(parseInt(numPart, 10));
           }
         }
-        let nextIndex = 1;
-        while (usedIndices.has(nextIndex)) {
-          nextIndex++;
-        }
-        childSku = `${father.sku}-${nextIndex}`;
       }
-
-      // Check if child SKU already exists (e.g. orphan holding SKU or custom SKU)
-      const existingChildRes = await runner.query(
-        'SELECT id FROM article WHERE sku = @childSku AND company_id = @companyId',
-        { childSku, companyId },
-      );
-      if (existingChildRes.rows[0]) {
-        throw new Error(`Child article "${childSku}" already exists`);
+      let nextIndex = 1;
+      while (usedIndices.has(nextIndex)) {
+        nextIndex++;
       }
+      const childSku = `${father.sku}-${nextIndex}`;
 
       // Next free fathersort (smallest non-negative integer not used by any child of this father)
       const existingSortsRes = await runner.query(
@@ -177,7 +174,7 @@ export default function addChild(provider) {
         fathersort++;
       }
 
-      // Create child article
+      // Auto-create child article
       const rawTrack = options.track_stock ?? options.trackStock;
       const finalTrackStock = rawTrack == null ? father.track_stock : (rawTrack ? 1 : 0);
 
diff --git a/src/store/article/attachChild.js b/src/store/article/attachChild.js
new file mode 100644
index 0000000..2968b31
--- /dev/null
+++ b/src/store/article/attachChild.js
@@ -0,0 +1,321 @@
+import * as mssqlArticle from '../../providers/mssql/queries/article.js';
+import * as sqliteArticle from '../../providers/sqlite3/queries/article.js';
+import * as mssqlAttrVal from '../../providers/mssql/queries/attributevalue.js';
+import * as sqliteAttrVal from '../../providers/sqlite3/queries/attributevalue.js';
+import * as mssqlArticleAttrVal from '../../providers/mssql/queries/articleattributevalue.js';
+import * as sqliteArticleAttrVal from '../../providers/sqlite3/queries/articleattributevalue.js';
+import { ADD as MSSQL_ADD_CATEGORYARTICLE } from '../../providers/mssql/queries/categoryarticle.js';
+import { ADD as SQLITE_ADD_CATEGORYARTICLE } from '../../providers/sqlite3/queries/categoryarticle.js';
+import { INSERT as MSSQL_INSERT_HISTORY } from '../../providers/mssql/queries/articlehistory.js';
+import { INSERT as SQLITE_INSERT_HISTORY } from '../../providers/sqlite3/queries/articlehistory.js';
+import resolveArticleBySku from './resolveArticleBySku.js';
+import getBySku from './getBySku.js';
+import listChildren from './listChildren.js';
+import makeRunner from '../runner.js';
+
+export default function attachChild(provider) {
+  const resolve = resolveArticleBySku(provider);
+  const load = getBySku(provider);
+  const list = listChildren(provider);
+  const isSqlite = provider?.dialect === 'sqlite3';
+
+  const queries = isSqlite ? sqliteArticle : mssqlArticle;
+  const attrValQueries = isSqlite ? sqliteAttrVal : mssqlAttrVal;
+  const articleAttrValQueries = isSqlite ? sqliteArticleAttrVal : mssqlArticleAttrVal;
+  const addCategoryArticleSql = isSqlite ? SQLITE_ADD_CATEGORYARTICLE : MSSQL_ADD_CATEGORYARTICLE;
+  const insertHistorySql = isSqlite ? SQLITE_INSERT_HISTORY : MSSQL_INSERT_HISTORY;
+
+  /**
+   * Attaches an existing article as a child to a father article.
+   *
+   * @param {number} googleAuthId - The id of the Google auth user.
+   * @param {string} fatherSku - The father article SKU.
+   * @param {object} options
+   * @param {string} options.sku - The child article SKU to attach.
+   * @param {string} [options.childSku] - Alias for options.sku.
+   * @param {number} [options.attributeValueId] - Existing attribute value ID for father's attribute.
+   * @param {string} [options.value] - String value to find or create under father's attribute.
+   * @param {boolean} [options.reparent=false] - Whether to allow re-parenting if child belongs to another father.
+   * @param {number} [options.unitamount] - Optional unitamount override.
+   * @param {number} [options.weight] - Optional weight override.
+   * @param {boolean|number} [options.track_stock] - Optional track_stock override.
+   * @param {object} [tx] - Optional transaction.
+   * @returns {Promise<{article: object, children: Array<object>}>}
+   */
+  return async (googleAuthId, fatherSku, options = {}, tx) => {
+    const run = async (runner) => {
+      const childSku = (typeof options.sku === 'string' && options.sku.trim())
+        || (typeof options.childSku === 'string' && options.childSku.trim())
+        || null;
+
+      if (!childSku) {
+        throw new Error('sku is required to attach an existing article');
+      }
+
+      const { articleId: fatherId, companyId, languageId, companyuserId } = await resolve(
+        googleAuthId,
+        fatherSku,
+        runner,
+      );
+
+      // Fetch father article fields
+      const fatherRes = await runner.query(
+        'SELECT id, sku, company_id, is_father, fatherattributename_id FROM article WHERE id = @fatherId',
+        { fatherId },
+      );
+      const father = fatherRes.rows[0];
+      if (!father) {
+        throw new Error('Father article not found');
+      }
+      if (!father.is_father || !father.fatherattributename_id) {
+        throw new Error('Article is not a father article');
+      }
+
+      // Check child article exists in company
+      const childRes = await runner.query(
+        'SELECT id, sku, company_id, fatherarticle_id, is_father FROM article WHERE sku = @childSku AND company_id = @companyId',
+        { childSku, companyId },
+      );
+      const child = childRes.rows[0];
+      if (!child) {
+        throw new Error('Article not found');
+      }
+      if (child.id === fatherId) {
+        throw new Error('An article cannot be a child of itself');
+      }
+
+      // Determine attribute value
+      let finalValueId = null;
+      let finalValue = null;
+
+      if (options.attributeValueId != null) {
+        if (typeof options.attributeValueId !== 'number' || !Number.isInteger(options.attributeValueId) || options.attributeValueId <= 0) {
+          throw new Error('Invalid attributeValueId');
+        }
+        const valRes = await runner.query(attrValQueries.GET_BY_ID_AND_COMPANY, {
+          id: options.attributeValueId,
+          companyId,
+        });
+        const row = valRes.rows[0];
+        if (!row || row.attributeId !== father.fatherattributename_id) {
+          throw new Error('Attribute value not found or does not match father attribute');
+        }
+        finalValueId = row.id;
+        finalValue = row.value;
+      } else if (typeof options.value === 'string' && options.value.trim()) {
+        const valStr = options.value.trim();
+        const existingValRes = await runner.query(attrValQueries.GET_BY_ATTRIBUTE_AND_VALUE, {
+          attributeId: father.fatherattributename_id,
+          value: valStr,
+        });
+        if (existingValRes.rows[0]) {
+          finalValueId = existingValRes.rows[0].id;
+          finalValue = existingValRes.rows[0].value;
+        } else {
+          const sortRes = await runner.query(attrValQueries.GET_NEXT_SORT, {
+            attributeId: father.fatherattributename_id,
+          });
+          const sort = sortRes.rows[0]?.sort ?? 0;
+          const createdValRes = await runner.query(attrValQueries.CREATE, {
+            attributeId: father.fatherattributename_id,
+            value: valStr,
+            sort,
+          });
+          finalValueId = createdValRes.rows[0]?.id ?? createdValRes.insertId;
+          finalValue = valStr;
+        }
+      } else {
+        throw new Error('Attribute value is required for child article');
+      }
+
+      const isAlreadyChildOfThisFather = child.fatherarticle_id === fatherId;
+
+      if (child.fatherarticle_id != null && !isAlreadyChildOfThisFather && !options.reparent) {
+        throw new Error('Article already belongs to another father');
+      }
+
+      // Check if father already has a different child with this attribute value
+      const existingVariantRes = await runner.query(
+        `SELECT a.id
+         FROM article a
+         INNER JOIN articleattributevalue aav ON aav.article_id = a.id
+         WHERE a.fatherarticle_id = @fatherId
+           AND a.id != @childId
+           AND aav.attributevalue_id = @finalValueId`,
+        { fatherId, childId: child.id, finalValueId },
+      );
+      if (existingVariantRes.rows.length > 0) {
+        throw new Error('Variant with this attribute value already exists');
+      }
+
+      // If re-parenting from another father, unparent and recompact previous father
+      if (child.fatherarticle_id != null && !isAlreadyChildOfThisFather && options.reparent) {
+        const prevFatherId = child.fatherarticle_id;
+        await runner.query(insertHistorySql, {
+          articleId: prevFatherId,
+          companyuserId,
+          text: `Variante (${childSku}) getrennt (umgehängt zu "${father.sku}")`,
+        });
+
+        // Recompact previous father's children
+        const prevRemainingRes = await runner.query(
+          'SELECT id, fathersort FROM article WHERE fatherarticle_id = @prevFatherId AND id != @childId ORDER BY fathersort ASC, id ASC',
+          { prevFatherId, childId: child.id },
+        );
+        for (let i = 0; i < prevRemainingRes.rows.length; i++) {
+          const row = prevRemainingRes.rows[i];
+          if (Number(row.fathersort) !== i) {
+            await runner.query(queries.SET_FATHER_SORT, {
+              articleId: row.id,
+              fatherArticleId: prevFatherId,
+              fathersort: i,
+            });
+          }
+        }
+      }
+
+      // Assign fathersort if not already child of this father
+      let fathersort;
+      if (isAlreadyChildOfThisFather) {
+        const currentSortRes = await runner.query(
+          'SELECT fathersort FROM article WHERE id = @childId',
+          { childId: child.id },
+        );
+        fathersort = Number(currentSortRes.rows[0]?.fathersort ?? 0);
+      } else {
+        const existingSortsRes = await runner.query(
+          'SELECT fathersort FROM article WHERE fatherarticle_id = @fatherId ORDER BY fathersort ASC',
+          { fatherId },
+        );
+        const usedSorts = new Set(existingSortsRes.rows.map((r) => Number(r.fathersort)));
+        fathersort = 0;
+        while (usedSorts.has(fathersort)) {
+          fathersort++;
+        }
+      }
+
+      // Link child to father
+      await runner.query(queries.UPDATE_FATHER_BY_SKU, {
+        sku: childSku,
+        companyId,
+        fatherArticleId: fatherId,
+        fathersort,
+      });
+
+      // Apply optional field overrides
+      if (options.unitamount != null) {
+        await runner.query('UPDATE article SET unitamount = @unitamount WHERE id = @childId', {
+          childId: child.id,
+          unitamount: options.unitamount,
+        });
+      }
+      if (options.weight != null) {
+        await runner.query(queries.UPDATE_WEIGHT, {
+          articleId: child.id,
+          weight: options.weight,
+        });
+      }
+      const rawTrack = options.track_stock ?? options.trackStock;
+      if (rawTrack != null) {
+        await runner.query(queries.UPDATE_TRACK_STOCK, {
+          articleId: child.id,
+          trackStock: rawTrack ? 1 : 0,
+        });
+      }
+
+      // Remove existing attribute value for this father's attribute on child (if any)
+      if (father.fatherattributename_id) {
+        await runner.query(
+          `DELETE FROM articleattributevalue
+           WHERE article_id = @childId
+             AND attributevalue_id IN (
+               SELECT id FROM attributevalue WHERE attribute_id = @attributeId
+             )`,
+          { childId: child.id, attributeId: father.fatherattributename_id },
+        );
+      }
+      await runner.query(articleAttrValQueries.INSERT_ROW, {
+        articleId: child.id,
+        attributeValueId: finalValueId,
+        sort: 0,
+      });
+
+      // Copy ancestor attributes from father (if missing on child)
+      const fatherAttrsRes = await runner.query(
+        'SELECT attributevalue_id, sort FROM articleattributevalue WHERE article_id = @fatherId',
+        { fatherId },
+      );
+      for (const faRow of fatherAttrsRes.rows) {
+        if (faRow.attributevalue_id !== finalValueId) {
+          const hasAttrRes = await runner.query(
+            'SELECT 1 FROM articleattributevalue WHERE article_id = @childId AND attributevalue_id = @attrValId',
+            { childId: child.id, attrValId: faRow.attributevalue_id },
+          );
+          if (hasAttrRes.rows.length === 0) {
+            await runner.query(articleAttrValQueries.INSERT_ROW, {
+              articleId: child.id,
+              attributeValueId: faRow.attributevalue_id,
+              sort: faRow.sort,
+            });
+          }
+        }
+      }
+
+      // Copy father's categories (if missing on child)
+      const catRes = await runner.query(
+        'SELECT category_id FROM categoryarticle WHERE article_id = @fatherId',
+        { fatherId },
+      );
+      for (const catRow of catRes.rows) {
+        const hasCatRes = await runner.query(
+          'SELECT 1 FROM categoryarticle WHERE article_id = @childId AND category_id = @categoryId',
+          { childId: child.id, categoryId: catRow.category_id },
+        );
+        if (hasCatRes.rows.length === 0) {
+          await runner.query(addCategoryArticleSql, {
+            categoryId: catRow.category_id,
+            articleId: child.id,
+          });
+        }
+      }
+
+      // Fetch child name for history
+      const childTextRes = await runner.query(
+        'SELECT name FROM articletext WHERE article_id = @childId AND language_id = @languageId',
+        { childId: child.id, languageId },
+      );
+      const childName = childTextRes.rows[0]?.name || childSku;
+
+      // History only if not already child
+      if (!isAlreadyChildOfThisFather) {
+        await runner.query(insertHistorySql, {
+          articleId: child.id,
+          companyuserId,
+          text: `Artikel "${childName}" (${childSku}) als Variante von "${father.sku}" zugewiesen`,
+        });
+
+        await runner.query(insertHistorySql, {
+          articleId: fatherId,
+          companyuserId,
+          text: `Variante "${childName}" (${childSku}) hinzugefügt`,
+        });
+      }
+
+      const updated = await load(googleAuthId, childSku, runner);
+      const children = await list(googleAuthId, fatherSku, runner);
+
+      return {
+        article: updated.article,
+        children,
+      };
+    };
+
+    if (tx) {
+      return run(makeRunner(provider, tx));
+    }
+    if (typeof provider?.transaction === 'function') {
+      return provider.transaction(run);
+    }
+    return run(makeRunner(provider));
+  };
+}