Hello, I'm trying to add a suggested gratuity to the bottom of the checks in my restaurant. I would like to have 3 suggestions for a tip of it being 15, 18, or 20 percent of what the total check is and have that be calculated automatically. I was told to do this I would have to enter codes in the sim file. Can anyone explain how I would access this file and the steps I would have to take to insert the suggested gratuities? Thank you very much!