Steps
Open the bill: click ⋮ on its row and choose Open.
Click Actions → Manage payments.
Add one line per payment:
Date you paid.
Payment account: the bank or cash account the money left, e.g. Chase Business Checking.
Amount.
Check the Balance and Total, then click Save.
Tips
Paying in instalments? Add a new line each time you pay.
Already paid when you received the bill? Use Add payment information on the bill form, or record an Expense instead.
When you reconcile your bank, match the bank line to this payment so it isn't counted twice.