SHELL

git copy branch to another branch

git checkout -b new_branch old_branch

copy one branch to another git

git checkout <branch1name>  # <branch1name> is the new branch
git merge <branch2name>     # <branch2name> is the branch from which you want to copy

copy data from one branch to another in git

git checkout BranchB
git merge BranchA

git copy branch to another

git checkout old_branch
git branch new_branch