From the Tags window need option to move tag(s) as a subtag

[Mark78 46]

When you click on Tags in the left pane and it brings up all the tags (VERY nice), when you click on an individual tag and a drop-down presents a few options, an important one is missing: the ability to move the tag to be a subtag under another tag. Please implement this, as is very important.

Frankly, it would be good to have a way to select more than one tag and then be able to move all of them as a subtag under another tag. THANK YOU!