Select where you want the drop-down list to appear. Click the Data tab and select Data Validation in the Data Tools group. A Data Validation dialog box will appear.

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 ...

Microsoft Excel can save you time in lots of little ways, like adding a drop-down list to cells so that only pre-written text can be entered.