Hey @max.petrivskyi,
Thanks for posting this question!
We've discussed this previously, here:
Basically, there's no generic mutli-select field in Prismic. However, you can create a multi-select by putting a Select field inside of a Group field.
If a Select field isn't powerful enough for your use case, you could consider creating a Custom Tagging system:
If you just need simple tags, you can use Prismic's default tagging system, which using a multi-select input:
I hope this helps. Let me know if you have any other questions.
Sam
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