Hi there, @Sharmonet57.
The option to apply a customer's credit balance to another customer's invoice is unavailable in QuickBooks. When a customer overpays, the resulting credit balance can only be applied towards that same customer's future transactions.
For additional reference about applying customer overpayment, you can check out this article: Handle a customer credit or overpayment in QuickBooks Online.
In addition, there are various scenarios for recording a customer refund in QuickBooks. You can check them out in this resource: Record a customer refund in QBO.
If you have further questions about applying customer credits in QuickBooks, add them to the thread. We'll be here to help you out. Have a good one.
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