For scheduling within the workbenches, you only set up the base process item on production lines, so, there is no need for specific co-/by-product item setup. Since the co-/by-products are defined for a base process, when you add the base process to a production line, the system automatically adds the co-/by-products to that production line.

You only set up the base process on the production line because the system adds the co-and by-products automatically. You can also setup a co-product on a production line and the system adds its primary base process (BOM/formula on the item) and related co-and by-products to the production line.

When scheduling a co-/by-product order sets, all order parameters, such as routing, BOM, run rate, setup time, default from the base process item. When you set up production lines, the system only considers the production line item field values for the base process item. The system does not consider production line item records for co-/by-product items for scheduling purposes.

For work centers/operation, the run rate, setup time, and so on are based on the routing of the base process item, too.