List items in the product catalog
After the catalog is created, and an item is of the list type, the original list item will no longer be visible in the catalog. Only the components of the list item become part of the catalog. Because the list item is exploded when the catalog is created, the list component's quantity cannot be used when creating the item line in your list. If the list item's components change after the catalog is created, the current catalog is not updated. However, each time the catalog structure with the list item as a member is used to create a new catalog, the changes in the list item's components are updated during the creation process.