If you have an arrangement with a supplier where you are required to make multiple prepayments (before products are shipped), this is called Payment Installments. You can follow the steps below to set up.
1. Create a payment term (from Enterprise Setup, Payment terms) and check the option Has Installments. Enter the Installments you have in terms of % for each payment. You can have as many as you like.
2. Create a purchase order and choose the term you just created. Enter the purchase order as you normally would.
3. Create a new bill for the supplier on the PO and choose the PO item under the Prepayments for Products on P/O to create a new bill item. The system would choose the first installment for you automatically. Enter the quantity you are prepaying. The unit price is locked and must be the same as the PO.
4. Depending on your arrangement with the supplier, if you receive products after making the first installment, receive the product as you normally would. If the received product must be paid (the prepayment only cover some of the received products), create a new bill on the supplier and choose the PO under Link to shipment receipts to create a new bill item. The system would calculate the portion that needs to be paid for you. If you need to make additional installment payment before the product would ship, create a new bill and choose the option Prepayments for Products on P/O to create a new bill item again. The system would follow the installment set up in the payment term to determine the % to apply.
The system tracks the amount of prepayment on a PO vs value already received so if you have already pay for all products being received, there is no need to create a bill to pay for a shipment.