Keeping track of customers who owe me.
I am new to this and I just started my own gutter cleaning business so I only sell a service not products. I have been entering customers in Sales Receipts but I can't mark who paid and who didn't. When I enter a customers name for the first time there is a box that asks if there is an opening balance soi I don't know if this is the right way or not. If it is the right way then these are my questions. How do I go back to a customers name to add an opening balance? Should I put in an opening balance?