Hello there, JimPost.

Thanks for getting back. I want this to be taken care of and help you handle customer prepayment in QuickBooks Online (QBO).

I have one quick way to directly post the deposit as a credit to the customer. You'll just need to change the Other Current Liabilities to Accounts Receivable.

When you create a Bank Deposit, you use the Accounts Receivable with the name of customer and then you can apply this to the invoice through Receive Payment.

That should keep you on the right track. Let me know if you have follow-up questions about customer prepayments and I'd be glad to clear things up for you.