Thank you very much, this is very helpful for the WP blog we are working on, which would mirror our static site’s hierarchy of categories.
Still facing two stumbling blocks:
1. An enhancement for this solution would be a category tree that expands only the children of the current category Bx.
2. How can I replicate this on single post pages? That is, idnetify the posts affiliation with a specific category Bx, and present its sister subcats, that is all the other children of BX?
Best
