Check and uncheck the invoices by clicking into the leftmost checkmark column to apply and remove payment amounts, as needed. QuickBooks automatically attributes the amount entered against all the outstanding invoices shown, from oldest to newest. Then enter the payment date, amount, and payment method at the top of this window. Select the customer or customer:job who sent you the payment from the “Received From” drop-down. Doing this then opens the “Receive Payments” window. To apply one payment to multiple invoices in QuickBooks, select “Customers| Receive Payments” from the Menu Bar.
Repeat this until the total payment has been distributed to the correct invoices. To do this, place a checkmark in the checkmark column to the left of the invoices against which you want to apply the cumulative payment amount received.
You can apply one payment to multiple invoices in QuickBooks for a single customer. Apply One Payment to Multiple Invoices in QuickBooks: Overview