To record a partial payment on an invoice:

1. Open the invoice from the list
2. Click "Record Payment" or the payment action
3. Enter the amount received (less than the total)
4. Save - the invoice status changes to Partially Paid
5. Repeat when additional payments arrive

Tip: The remaining balance is tracked automatically and appears on the invoice detail page. Partially paid invoices also get their own reminder suggestion that asks for the remaining balance. In the customer portal, partially paid invoices show the amount already paid and the remaining balance before the customer completes payment.