someone help with creating a copytag???

i wanna make a copytag for pepoyo (consider the fact that other popular vocaps like kikuo have copytags, and pepoyo has a lot of ocs (including characters who have never appeared in songs) that people regularly draw fanart of) but idk how to go about creating a copytag that retroactively gets applied to other pics?? if someone else here has done this before then i'd really appreciate your help!

Edit a post you want to add the copytag to, adding copy:tag_name. Then add it to all posts that apply to it.

You would have to create the tag and either manually add it to the posts, or make a Bulk Update Request. You can click either "Request alias/implication" or "BURs" -> New to start the process. In the Request box, you have to type out the action you want to happen. There is a guide on top that tells you how it works.

In your case, you'd be using update request to add the tag to any posts that matches the criteria you specify.

In the example given in the guide: update bunny solo no_humans -> animal_focus
This searches for bunny solo no_humans and adds the tag animal focus.

Since you want to add this tag to posts with the OCs, there are several ways you can do this:

Create a request with multiple updates for each of the OCs:

update charname1 -> pepoyo
update charname2 -> pepoyo
update charname3 -> pepoyo

Or put them all in the same line: update charname1 or charname2 or charname3 -> pepoyo

Or you can manually add the posts into your own favgroup and update the favgroup instead (Although at this point, you might as well just manually add the tag. This method is more for requests that have to be approved by an admin first).