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 ...

To add a formula in Google Sheets, click the cell where you want the answer, then choose one of the hundreds of functions.

You can combine two columns in Excel using several formulas and tools available in the software. Here's how to combine two columns in Excel.