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Excel's data validation is far more powerful than just dropdowns — here's what it can actually enforce
Most people set up a dropdown list to make spreadsheets smarter with Excel's data validation. However, the Custom option in the Data Validation dialog accepts any formula that returns TRUE or FALSE, ...
How-To Geek on MSN
Everything you need to know about drop-down lists in Microsoft Excel
From simple lists to dynamic spill ranges and cascading menus, Excel drop-downs offer flexible control over data entry.
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