Predetermined Tags

[cpradio]

I’m uncertain what your question is specifically, but you can create a whitelist of usable tags as described at

Whitelisting tags

You can do that. Set min trust to create tag to 4, then as an Admin create a topic in an admin only area and add the tags you want to permit to that topic, so all of them have been created. Now any user who qualifies with min trust level to tag topics can use the tags you have setup.