Problem: I would like to show hierarchical taxonomies in CRED and in Views filters. At first, only the top-level terms should be shown. Then as the User selects terms, the child terms of those terms become visible.
Solution: There's not a simple way to accomplish this type of stepped interface in CRED or in Views. It may be possible to accomplish something similar in CRED using a dynamic system of generic fields and conditionals. I've helped another User set up something similar in this ticket: @https://toolset.com/forums/topic/categories-display/
The general idea is that you set up a generic field that contains each of the top-level terms in the taxonomy. Then you create separate generic fields that contain the subcategories of each top-level term. Show and hide the subcategory generic fields based on the selection in the top-level generic field using CRED conditionals. You can follow the example here that shows how to use a View to populate the options of a generic field dynamically: @https://toolset.com/forums/topic/how-use-a-shortcode-instead-of-options-for-cred-forms
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