Use a JetEngine Listing for the parent taxonomy terms
Query the parent category term by its ID, slug, or current post term
Enable hierarchical taxonomy support in the query settings
Set the query to return child terms only
Use the parent term ID as the parent filter in the taxonomy query
Add a custom query with a taxonomy term parent parameter
In the Listing Grid, assign the taxonomy query to the listing source
Use dynamic tags to pass the current parent category ID
Filter terms where the parent value matches the selected category
If needed, use a custom callback or query builder to fetch child categories
Display the child category listing inside the parent category template
Check that the taxonomy is hierarchical and has child terms assigned