I have a pretty large way of managing my tags/ nested tags.
I begin by creating categories of tags - herein my example is "Tags by Partners"
Then I nest tags within those categories.
However one thing I noticed is that when I nest them with the categories I made, they are not organized or sorted in an alphabetic manner - And there is no way to organize or sort them according to my own preference.
I am using a Macbook Pro - OS Sierra by the way.