Suppose the master branch is http://10.1.1.1/group/project (group can be the project group name)
Development requires Fork branch to http://10.1.1.1/staff/project (staff is the account of the specific developer)
Then set Upstream to master branch git remote add upstream http://10.1.1.1/group/project
Then submit a PR after the change
For merging of master branch use git fetch upstream && git merge upstream/master
To merge specific commits use git cherry-pick #commit_id#