Example: Current existing tag is School/Math/Algebra/Week 1.

If I wanted to create a new tag that goes one step further to include a particular lecture (lecture 3) I would have to click the "new tag" button, then literally type out from scratch School/Math/Algebra/Week 1/Lecture 3. That takes too long and requires too much effort.

I would like to be able to select an existing tag path (School/Math/Algebra/Week 1) and only have to type out /Course 3 at the end of it. This would make creating tags much less of a nuisance in my opinion.