I'm going to start by saying I have 0 accounting experience, I've been pretty much learning as I go for the past 6 months and having a professional come in on the weekend and complete what I can not do. I use quickbooks 2012. The situation is; We had sold some machines for a costumer, during the process of selling them we allowed that costumer to come in for repairs and not pay right away. Now we have sold all the machines and the open balance for the costumer has recently exceeded the money we made from selling his machines. Now we need to make a $1,000 credit memo and apply it to multiple invoices. When I create the credit memo I don't want to make it represent its 1,000 dollars worth of parts or 1,000 dollars worth of labor. Entering in each item individually is the only way I can think of that will not mess up the books, but that is very time consuming. We have Invoices for all the machines we sold for said customer. What is the easiest and accurate way to create this memo.

I fail to understand why this credit you are granting must be applied to various invoices. Unless you are ageing an account it stands alone.

You have an outstanding balance for a customer and you want to set off this credit against his debtors account. You can do this with a journal or you can create a line item; Sales Commission or some suitable title and detail the calculation as text..