Pay on Sales Order

Upon clicking Pay on Sales Order, the Sales Order screen opens.  Click Find to search for a sales order.
Pay on Sales Order
Enter the appropriate search criteria and click Find Now, or click Find Now without any search criteria to display a list of all sales orders.  Click on the correct sales order, and click Select.
The Sales Order screen opens.  Click Payment to make a payment.
Pay on Sales Order
The Amount to Pay screen opens with the current balance entered into the Payment Amount field.  Enter the payment amount, and click OK.
Select the payment method, and complete the payment.
For a complete overview of searching for sales orders, the Sales Order screen, and making payments on sales orders, see SO | Modify Order.