https://git-scm.com/book/en/v2/Git-Internals-The-Refspec#_pushing_refspecs
Pushing Refspecs
It’s nice that you can fetch namespaced references that way, but how does the QA team get their branches into a qa/ namespace in the first place? You accomplish that by using refspecs to push.
If the QA team wants to push their master branch to qa/master on the remote server, they can run
$ git push origin master:refs/heads/qa/master
If they want Git to do that automatically each time they run git push origin, they can add a push value to their config file (/.git/config>):
[remote "origin"]
url = https://github.com/schacon/simplegit-progit
fetch = +refs/heads/*:refs/remotes/origin/*
push = refs/heads/master:refs/heads/qa/master
Again, this will cause a git push origin to push the local master branch to the remote qa/master branch by default.