[Feature Request]: Adding subtags to other tags in bulk

[Elzrix]

Checklist

• I am using an up-to-date version.
• I have read the documentation.
• I have searched existing issues.

Description

I've been enjoying this program, but I've found actually migrating data to be a bit of a hassle. I think the ability to add subtags to existing tags as a group would be a nice way to ease the process.

Solution

An example might be something like this:
You've created the following tags and applied them to all relevant files

character1 / anime
character2 / anime
character3 / anime
character4 / anime

Great! but now you've decided that you want to get more specific and add subtags to specific characters tags for different traits, i'll use gender as an example

character1 / anime, male
character2 / anime, male
character3 / anime, female
character4 / anime, male

Right now you need to go to each tag individually and add the desired subtag, which gets increasingly cumbersome with tag specificity. In this example it would be nice if, in the same way you can tag multiple files at once, select the qualifying tags as a group and add the desired subtag to all of them simultaneously.

Alternatives

No response

[Bamowen]

To expand on this, creating any type of tag in bulk could be a nice QoL change!

[CyanVoxel]

This sounds like a perfect use for a dedicated tag management tab/pane that I've had in mind for a while! (would close #19)

I don't have any wireframes or mockups to share, but this feature request will definitely help shape what that could look like. Bulk operations on tags in a similar way to how bulk operations on files work would be a great feature for this!