Microsoft Excel's Data Validation tool lets you add a drop-down list to a cell based on existing data in a column. However, how this works depends on whether the source data is part of a formatted ...

If your Excel lists repeats values and you need help finding changes, try this easy conditional format. One of the most frequent requests I receive from readers is how to highlight list values when ...

Select winners in Excel using classic INDEX formulas or modern CHOOSEROWS and TAKE combinations.

You can't use a SUM() function to sum a filtered list, unless you intend to evaluate hidden and unhidden values. Here's how to sum only the values that meet your filter's criteria. Filters are a ...