Hello Maytree73,
Welcome to the Community page,
If you have overpaid a supplier then when you select make payment you enter the amount that you actually paid the supplier and this will auto create the supplier credit, if you want to use this credit in the future then you simply leave the credit on the system and attach it when you make payment on another bill. If the supplier is paying the amount back then you would also create a deposit and in the account column of the add funds this deposit section select the creditors account and enter the amount, you would then link the deposit and the credit that has been created by creating a cheque payment, enter the suppliers name in the payee field and the deposit and credit will appear, add them, save and close.
