You still have not fully answered my original question and now you are talking about credits. Why would there be a credit from the vendor? Remember, the situation is that we created a purchase order and the vendor sent us the bill and is asking for a 50% deposit before they ship anything to us. So, how do I enter a bill and connect it with the purchase order but only pay 50% of the price without it affecting the line item prices on the PO and without the PO showing items as being received, because we have not received them yet? Even when we do receive the items, we will need to pay the other 50% of the total and then we will have to receive items on the purchase order, but again, we do not want to change the price of the original items on the purchase order. 

There is nothing about a credit that we will have to deal with in this situation. Does this make sense? We have a purchase order and once we receive the items on the purchase order, the receiving team will go in and receive them in Quickbooks and then I would receive a bill from a vendor and I would go in and Enter Bill Against Received Items. However, I now have a bill and NO received items and they only want 50% of the bill. What should I do to get this entered and paid?