Base a Data Validation dropdown on the Region values. Now, let’s use UNIQUE () to create a unique list of region values and then base a data validation dropdown on that list.

To create a drop-down list in Excel, you will use the Data Validation feature. This feature enables you to set specific criteria for the data that can be entered into a cell.

When you update this spreadsheet with new or different data, you won’t have to re-create the validation rule, but you will need to click Circle Invalid Data again. This tool would be useful to bring ...