Banking & Currency

I appreciate your detailed illustration to visualize your issue, @GGG4. Let me guide you on how to handle this below.

To start, you'll need to receive the payments for both Customer 1 and Customer 2 as you normally would. Make sure to select Payments to deposit in the Deposit To drop-down menu.

Selecting Payments to deposit keeps the payments for Customer 1 and Customer 2 in a temporary holding account also called Undeposited Funds. This step is crucial to properly combine the payments into a single bank deposit later.
 

Once you’ve received the payments for both invoices, proceed to create a bank deposit.
 

Here’s how:

1. Go to the + New button and select Bank Deposit.
2. In the Select the payments included in this deposit section, make sure to check Customer 1 and Customer 2 only.
3. Enter Customer 3 in the Received From field and select Accounts Receivable in the Account section to link it to the customer’s payment.
4. Enter -500 in the Amount field.
5. Once done, click Save and Close.

After creating the bank deposit, navigate to Customer 3’s payment. Edit the payment and tick the deposit box to specify whether it’s an overpayment or a credit memo. Once done, click Save and Close. By doing this, the $-500 balance for Customer 3 will now appear in the list, allowing you to match your transaction successfully.
 

I'll leave this article for you if you'd like to customize your invoice in the future: Customize invoices, estimates, and sales receipts in QuickBooks Online.
 

We're always here to help! If you need further assistance with matching your transaction in QBO, feel free to respond to this thread. Have a great day!