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I need to create a form where they will be 20 choices(time slots) in drop down menu. If a choice is chosen, it should be unable to choose from again. How can I do this.

Kindly advise, thank you.

  • Chosen again in another list item? – Mike Smith - MCT - MVP Jul 9 '19 at 3:01
  • By "form", a default SharePoint add/edit form? Or a custom InfoPath or HTML/JavaScript form? – Mike Smith - MCT - MVP Jul 9 '19 at 3:05
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When you add a column to a list, you can enable the "Unique" option:

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No two list items will be allowed to have the same entered value. Similar to a unique constraint in SQL Server.

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How to prevent multiple selections of the same value in a drop-down in a table for your reference:

https://answers.laserfiche.com/questions/81032/How-to-prevent-multiple-selections-of-the-same-value-in-a-dropdown-in-a-table

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