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 676th installment in their series of digital spreadsheet magic tricks, you'll learn how to create a Defined Name formula for a dynamic range (columns can vary) using the INDEX and MATCH functions. This formula works when there are no column headers (field names).