Create a drop-down list - Microsoft Support
https://support.microsoft.com/en-us/office/create-a-drop-down-list-7693307a-59ef-400a-b769-c5402dce407b
WebDrop-downs allow people to pick an item from a list that you create. Windows macOS Web. In a new worksheet, type the entries you want to appear in your drop-down list. Ideally, you’ll have your list items in an Excel table. If you don’t, then you can quickly convert your list to a table by selecting any cell in the range, and pressing Ctrl+T.
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