Thanks for joining the thread, @BonBon004.
Yes, you can follow the steps given by my colleague, @Angelyn_T to create a check and payment. Then, select the check recorded and the existing credits.
Once done, you can also follow the steps on how to link the check and the unapplied amount.
For more information, you can visit this link: Handle a customer credit or overpayment in QBO.
You can also take a look at here on how to void or refund customer payments in QuickBooks Online.
Feel free to drop a comment below if you have other questions. I'm always happy to help. Take care!
