*Customer Payments>enter Customer ID

*Payment Type:  Cash

If Credit is more than invoices:

*Select all invoices that need to be paid with credit.  Note the total.

*Select the invoice with the credit, and in the Payment column (of the credit memo), enter negative and whatever total the other invoices added up to.

If Credit is less than invoices:

*Select credit you want to use up.  Note the total (a negative amount) in the payment column.

*Select the invoice you want to apply credit to.  In the payment column, enter a positive amount of whatever the credit is.  The amount in the top should become empty.

*Click Apply Credit and Print; send customer the receipt.