Idea concept build _ Sketch a concept, insert clip art or pictures, and use SmartArt to create a foundational visual... the base visual that you will build upon. Then add additional graphic components directly over the foundational visual. Alternatively you can create consecutive slides where you build increased complexity from the foundational slide so that you show how an idea concept develops and progresses layer_by_layer.
Customer Reminders: This is clever. Excel can be programmed to send an Email when a cell gets beyond a certain limit __ so if you're doing oil changes that should be done every few months, just collect the customer's Email address and have Excel use it to send them a helpful Email a few months after they had their oil changed last! The powers that Excel can offer your auto shop stretch so far beyond merely watching the profit margins that if you're not using it for more advanced functions, you're losing out. Stretch it's wings! Set some automatic alarms for your inventory and some automatic Emails for your customers, and see what Excel can do for you!