Hi,
If you need a different PO for transportation, you may check the concept of Transportation Management with inbound delivery. Please check the doc: http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/70fbd5dc-8f5f-2910-2085-c658dc145fe9?overridelayout=t…
You can configure whether you need a different service PO for transportation cost.. The procedure for OBD is described in the doc: Standard Shipment Process. You can follow the same for inbound as well.
Regards,
AKPT