I have Deposits enabled in the settings, but I don't see the below option (copied from one of the replies). I can't see where the initial question of requesting payment on a deposit was actually answered and am looking for the same information. I can see where to apply the deposit, but not any way to send an invoice with the total while only requesting that a deposit be made.

Additionally, with QuickBooks Payments, you can request an online estimate deposit by navigating to + New, selecting Estimate, then Enter the required estimate information. Within the sub-total area, select Request a deposit, then Enter the deposit amount and Email estimate.