introduce ability to make original and copy be linked to each other

config/products.php

@@ -8,4 +8,7 @@ return [
     'skipAttributesOnCopy' => [
 
     ],
+
+    // Make the original and source product 'related' via the 'product_relations' table
+    'linkProductsOnCopy'   => true,
 ];

packages/Webkul/Product/src/Repositories/ProductRepository.php

@@ -703,5 +703,12 @@ class ProductRepository extends Repository
                 $variant->save();
             }
         }
+
+        if (config('products.linkProductsOnCopy')) {
+            DB::table('product_relations')->insert([
+                'parent_id' => $originalProduct->id,
+                'child_id'  => $copiedProduct->id,
+            ]);
+        }
     }
 }

tests/functional/Product/ProductCopyCest.php

@@ -74,6 +74,11 @@ class ProductCopyCest
             'qty'        => 10,
         ]);
 
+        $I->seeRecord('product_relations', [
+            'parent_id' => $original->id,
+            'child_id'  => $copiedProduct->id,
+        ]);
+
         $flat = $I->grabRecord(ProductFlat::class, [
             'product_id' => $copiedProduct->id,
         ]);