@NumbersNC 

My apologies.  You're correct that you need to go line by line to apply the credits when you have equal A/R debit and credit entries. 

However, a workaround is to receive payment on all of the invoices at one time and deposit them into a bank Clearing Account (set one up if you don't have one).  That clears all of the invoices (A/R debits) and leaves the credits open.  Then, create a journal entry that debits A/R and credits the Clearing Account for the total amount in the Clearing Account.  That will give you one large invoice (A/R debit) to use to clear all of the A/R credits without having to go line by line.  The bank Clearing Account should be $0 after clearing the credits. 

If you're not aware, you can use the space bar to check an invoice/credit and the down arrow to go to the next line.  I find that quicker than having to click on each invoice/credit line with the mouse but to each their own.