It is not easy in Resilient and depends on where you will use those fields.
I have a solution for "Tab" view:
Show Select/Multi Select Fields
incident.properties.my_categoryFor each Category, use a section that will show the specific Sub Category Select/Multi Select field only if it matches the Category in reference.
Section, Criteria
incident.properties.my_category = Value A Show Select/Multi Select Fields
incident.properties.my_category_aSection, Criteria
incident.properties.my_category = Value B Show Select/Multi Select Fields
incident.properties.my_category_bSection, Criteria
incident.properties.my_category = Value C Show Select/Multi Select Fields
incident.properties.my_category_cetc.
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BENOIT ROSTAGNI
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