Dropdown lists prevent data entry errors and make spreadsheets much easier to use.
Example: North,South,East,West
A dropdown arrow appears in the cell.
Instead of typing options, point to a range of cells. When you add items to the range, they appear in the dropdown automatically.
In the Source box, click the range selector and highlight your list of options (e.g. a column on a separate sheet). Or type the range directly: =$F$2:$F$10.
Combine Data Validation with UNIQUE so the dropdown always shows the current unique values from your data:
1. In a spare column, enter: =UNIQUE(A2:A100)
2. Name that spill range: select it, type "UniqueRegions" in Name Box
3. Use =UniqueRegions as the Source in Data ValidationIn the Data Validation dialog, click the Input Message tab and type a short instruction. It appears as a tooltip when the user clicks the cell — great for shared spreadsheets.
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