Add, change, or remove data validation - Microsoft Support
https://support.microsoft.com/en-us/office/add-change-or-remove-data-validation-ac6b6477-8529-4e38-bdb8-2364e5a344c6
WEBOn the Format menu, click Data Validation. In the Data Validation dialog box, click Add. Under If this condition is true, add a condition. Example. The following example shows how to create a data validation condition to ensure that data typed into a text box control matches a specific value — in this case, the word Hello.
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