Need help with cultural titles.

I've been messing around with some title modding for a huge mod I'm attempting and I've been stuck on cultural names for titles. As an experiment I created a titular Afghanistan title and wanted it to be called "Bactria" if held by a Greek. I tried different ways to make this change to the title happen but couldn't find a way to do so. I was wondering if anyone who's experienced in modding can help. Thank you in advance.

Also if anyone can let me know how to do something similar with council positions and minor titles I'd greatly appreciate it.