Just remember to do formulas right the first time (5 o'clock complaining)
Ugh my formula's wrong and it's spread out over 100 files. It was bad enough going back and entering the formula across all sheets the first time now I'm going to have to redo it. Is there any user define function available that might make this easier to update? I can understand that UDFs might not work with cross sheet formulas but for basic in-sheet formulas couldn't a UDF be executed using @cell references in the formula?