New to Microsoft Excel? Looking for a tip? How about a tip so mind-blowingly useful as to qualify as a magic trick? You're in luck. In this MS Excel tutorial from ExcelIsFun, the 557th installment in their series of digital spreadsheet magic tricks, you'll learn how to use the CHOOSE function look up a formula or function depending on your drop-down selection. See also how to create combo box form controls and data validation lists with the VLOOKUP function.