create copy of branch with a new branch with current branch code example

Example 1: creating copy of a branch

git checkout -b new_branch old_branch

Example 2: copy branch to master

git checkout master.
git checkout branch_from_which_you_have_to_copy_the_files_to_master . (with period)
git add --all.
git push -u origin master.
git commit -m "copy from branch to master"