Video: Create and manage drop-down lists - Microsoft Support
https://support.microsoft.com/en-us/office/video-create-and-manage-drop-down-lists-28db87b6-725f-49d7-9b29-ab4bc56cefc2
webSelect the cells that you want to contain the lists. On the ribbon, select DATA and choose Data Validation. In the dialog box, set Allow to List. Select the Source field and type the text or numbers for the drop-down list, separate by commas. For example, "Yes,No,Maybe" or "True,False." Select OK.
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