Change Parent of a Branch

Question

I have Branch a branch A checked out from master branch.then i have a branch B Checked out from branch A .

I want to change the parent of branch B to master

Current Tree

         master
        /
       A
      /
     B

Should Be

     master
     /   \
    A     B

Answer 1

You can use this command to change your parent branch:

git rebase --onto new_parent_branch old_parent_branch

In your case, use these commands:

1. git checkout B

2. git rebase --onto master A

Answer 2

git checkout B
git rebase A --onto master