I've got some kind of blog setup with different topics and each should use its own set of categories/tags.
Home
BlogTopic ACategories
Tags
Articles
Topic B Categories
Tags
Articles
Topic C Categories
Tags
Articles
How do I have to write my custom selector for categories/tags to choose just from the items within the current topic? I can't use one of the defaults (parent page or specific template). I need to select the 2nd parent and find the category or tag template. But couldn't figure out, how to go up two times.