I run a computer repair business. I want to use this software effectively and I think I have been using it wrong for a whole year. Here's one example what I want to use it for. **A Customer comes to me for a screen replacement on a laptop. I quote him $150 for the service. I write him an estimate. it shows on the estimate $95 for labor and $55 for the screen. Now, it's time for me to purchase the replacement screen. I find the screen for $45. Do I use the purchase order to reflect when I buy parts to fix a Customer's computer or if there's a different method to track that? Do I convert it to a bill or leave it as a purchase order. Once the Client pays off the service, is there a way to reflect that I just made a $10 + $95 Profit? Please Help!