applying allowance entries to accounts receivable
how do you apply a journal entry to Allowance to the outstanding Accounts Receivable balance to write it off?
how do you apply a journal entry to Allowance to the outstanding Accounts Receivable balance to write it off?

I'm not 100% sure what you are trying to do but look at this.
Go to receive payment for the customer and instead of an amount select discount. Put your "allowance" amount in as a discount. I am assuming that you have an account where you normally do this...use that account for the "discounted amount."
Just changing the amount owed on the customer's invoice will change your A/R balance.