Prevent duplicates before they happen by combining a simple function with data validation.

How to run a VBA procedure from a data validation control in Microsoft Excel Your email has been sent There are lots of ways to execute a VBA procedure in Microsoft Excel. You can add macro buttons at ...

The Data Validation feature in Excel 2013 offers a List option to confine selections in a cell to a preconfigured series of values. This selection can further influence the values in another list ...