I've been stumbling over this for hours now. I need to do exactly what is being discussed here: Make *ALL* Wordpress Categories use their Parent Category Template
I have a custom post type: "Research" and custom taxonomy "Classifications"
Under Classifications I have hierarchial "categories" as follows
Old Research
subcat1
subcat2
I have a working template file "taxonomy-Classifications-oldresearch.php" for the Old Research archive. However, the child categories are not using this and revert to "taxonomy-Classifications.php".
I would like all child categories to use the same template as the parent "old research", but I can't make the code in the link above work.