If yes, how do you add those constraints?

The docs for Groups and Tags suggests that it is possible by saying that it isn't for tags.

Tags allow multiple selections - so they may not be appropriate for mutually exclusive characteristics (e.g. "Democrat", "Republican", "Green Party")

1 Answer 1


I don't think there is any way you can do this using Tags or Groups. The alternative would be a custom field of type radio, and then build Smart Groups off those options.

  • Maybe an idea to update the docs Jun 29, 2017 at 7:08
  • Pls go ahead. Community projects like this benefit from people making improvements where they can see they are required.
    – petednz - fuzion
    Jun 29, 2017 at 21:19

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