Use data validation . Data validation is like setting the group rules for your Excel cells. It ensures that only the right ...

Open the Data Validation table by following the steps provided in the above fix. Under the Settings tab, click on the Clear All button. Click OK to save the changes.

Excel has built-in tools to expose and even delete duplicates, but they work on existing data after the fact. ... There’s no built-in duplicate rule for Excel’s Data Validation feature, ...

Under the Data tab, click on Data Validation. 2. In the settings tab of the pop-up window, under Source, add or delete list items as necessary, making sure all items are separated with a comma and ...