I have already entered a bill for the packing fees, but I used the service, not the assembly item build. 

I changed the PO to the assembly item build number for the items I need co-packed.  So, the raw material, packing, and service.  Then I changed the item receipt to show us receiving the assemblies, not the service.  This brings it into inventory so when the packing of the cases begins, they will have the first assembly of items to use for the finished goods. If there is a different way, please let me know.

Thank you so much for your help.