In earlier times, accounting was done manually. With the coming of computers and increased technological advancement, accounting is slowly transferring from manual to mechanical dependence. It saves a lot of time. Earlier, hours were spent on drawing the basic design of sheets and other financial instruments. But now, you have access to balance sheet templates, which have readymade categories and spaces for computing. Now, one just has to enter the amounts manually and all other things are done mechanically.
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!