The Custom Table Manager now has an updated Expand SKUs checkbox logic for Product > Item SKU and Primary SKU. The SKU expansion functionality allows you to create custom tables that expand your Primary SKUs and Item SKUs to the Item SKU level.
It is recommended that any users who have created custom tables using the old sku expansion functionality update the existing custom lists. For more details on how to create new expanded Item SKU lists or update existing expanded Item SKU lists, please refer to this document.