Thank you for the clarification, @lapin.
Another way of recording the transaction is through an invoice. This can be done by adding the upfront deposit on the line item under the Product/Service.
Before that, create a retainer item and use the item when recording an invoice. You can read this article as your guide: Record a retainer or deposit.
Let me know if you have any other questions. I'm a few clicks away to help. Have a good day!
