excel how to highlight data that appears more than once
Sometimes you just don't want data to repeat itself. On an order form or an inventory sheet, for instance, you may not want a part number entered in one cell to repeat in another cell. You can use Excel's Data Validation feature to to prevent a value from appearing more than once in a range.In the example below, the range A2:A20 requires unique part numbers.o create this type of message box for your worksheet: Select the cells for which you need to punch in unique entries (here, the correct range to select is A2:A20). Choose Data, Validation and click the Settings tab. Choose Custom from the Allow drop-down list.