I've made copies of products to be placed into new categories. After uploading the copied products I get this error message:
This product is invalid for the following reason(s): This product uses the SKU pricing option, but no default SKU has been defined. Therefore, this product cannot be displayed in the Online Store.
How do I give the new (copied) products a default SKU?
You may do this in bulk, or individually. To edit an individual product, edit the product, click next until you reach the page with SKUs. Select one SKU as the default by clicking the "default" box. To edit in bulk, use the attribute import found at Products / Import / Attribute Import. Enter Yes in the Default_SKU column for one sku per product.