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Creating a multi-select that uses dynamic values


very excited to be using! I’m trying to create a 2 stage selection flow for users:

I have a data type that uses ‘category’ and then ‘subcategory’ fields


  1. They choose something from selection box a (user can choose single or multiple options) from the category
  2. Based on what category/categories are selected from box a, box b shows subcategory options - they then choose several options from here

I’m not sure how to achieve my results - can anybody kindly help or provide an example/reference I can use please?