Merge up to a specific commit

Solution 1:

Sure, being in master branch all you need to do is:

git merge <commit-id>

where commit-id is hash of the last commit from newbranch that you want to get in your master branch.

You can find out more about any git command by doing git help <command>. It that case it's git help merge. And docs are saying that the last argument for merge command is <commit>..., so you can pass reference to any commit or even multiple commits. Though, I never did the latter myself.

Solution 2:

To keep the branching clean, you could do this:

git checkout newbranch
git branch newbranch2
git reset --hard <commit Id> # the commit at which you want to merge
git checkout master
git merge newbranch
git checkout newbranch2

This way, newbranch will end where it was merged into master, and you continue working on newbranch2.