Hello Robert, Good to see you in the Community! What you can do is create an invoice for the full amount and then utilise the deposit box option to deduct the amount already paid. If you do not have this turned on you can go to the cog in the top right>account and settings>sales>deposit>toggle on and save. Then exit that section. Then on the invoice, you can type in the amount already paid which will then leave the amount to pay if that makes sense.
