Here is how to make a partial payment on an invoice:
Step 1:
Open the invoice from the grid, locate the payment line in section 3 (Payment Schedule)
click on the arrow and select "Edit".
Adjust the amount to reflect the amount of the partial payment made by the customer
Click on "Pay"
Step 2: Enter the payment information in the "credit card" or "manual payment" window and save
Step 3: Following a partial payment, the payment calendar will automatically generate a new payment to show the missing balance.
Note: You can repeat these steps (1 to 3) as many times as you like. It is therefore possible to make as many partial payments as you wish.
i.e. The 80% payment above could in turn become a 20% payment, generating a new payment on the calendar corresponding to 60% of the invoice balance.