Use Credit Card to Pay Purchase Order?

How can we use our company credit cards to pay bills for inventory items that were bought, received, and billed using the purchasing process?

Add'l detail:

Our production managers often need to purchase materials from large industrial supply houses - they pay up front with a company credit card AND issue a PO# to the vendor which we need for our manufacturing process. However, after we receive the item into inventory, we need to do a vendor-bill (they won't send us an invoice - it's already paid by credit card!), and then the system tells us we have a bill to pay (but of course we do not). When making payment, we can only choose bank accounts rather than credit cards (of course, when we sell