Re: Removing credit from a customer to apply to another
Welcome to the Community. I'd be glad to provide a helping hand with your concern about customer credits in QuickBooks Desktop.
Once you're ready to move them from the unidentified account, you can try following the manual process on transferring customer credit using a clearing account and a journal entry. For the detailed steps on the process, I recommend following the steps in this article (scroll down to Manually transfer customer credit):