Returnable Package material

Hi Friends,

Need your help,

We purchase oil in drum and per pallet can hold 4 drums, after usage of oil we will send few drums and pallets back to vendor.

Questions I have :

Assumption :

1 Drum = 100 Lts

1. Do I need to create PO for Oil, drums and pallet, because while making receipt for 10,000 Lts of oil, system must understand I have received 100 drums and 25 pallets, there must not be any manual intervention in the process.

2. While returning, how I can handle partial return of empty Drums and pallets.

Thanks in Advance,

Ravi