By default, QuickBooks applies the payment to the oldest invoice
first, then to the next oldest, and so on. This happens when you enter the payment
(or click Auto Apply Payment) in the Receive Payments window.
If you want to distribute the payment to different invoices, perform the
steps described in this procedure.
To do this task
Click Un-Apply Payment.
If the payment hasn't been applied yet, you won't see the Un-Apply Payment button.
Instead the button will be Auto Apply Payment, in which case you can skip this step.
column, click next to each invoice to which you want
to apply the payment.
Each time you select an invoice, QuickBooks inserts the amount
to be applied to the invoice in the Payment column. When the
undistributed amount of the customer's payment is greater than
the amount due, QuickBooks pays the invoice in full. When the
undistributed amount is less than amount due, QuickBooks applies
the entire amount to the invoice, leaving a balance due on the
Receive and apply customer payments
Receive payments that are not customer-related (without invoices or statements)
Deposit customer payments