Fetch remote branches to your local repository.
git fetch origin QA
git fetch origin master
Fetch the branch that you need to merge
git fetch origin branch_that_you_want_to_merge
git checkout dev_combine
Merge branch_that_you_want_to_merge to dev_combine. Assumes that you are on dev_combine branch.
git merge origin/branch_that_you_want_to_merge
Push merge changes to remote repository
git push origin dev_combine
Switch branch to QA
git checkout QA
git pull origin QA
Merge dev_combine to QA branch. Assumes that you are on QA branch.
git merge origin/dev_combine
Push merge changes to remote repository
git push origin QA
Switch to master branch
git checkout master
git pull origin master
Merge QA to master. Assumes that you are on master branch.
git merge origin/QA
Make version tag
git tag 1.6.4
Push merge changes to remote repository
git push origin master --tags
Should take a back up of existing set
On the server should use sudo -u www-data git pull origin master