title: How to create branches on top of exiting branches in git?
body: <p>the title says everything. I want to create a branch on top of an existing branch. I tried to do it with switching to a new branch and creating a new branch while still having the branch checked out. But the Bitbucket.org-Page shows that I made something wrong, it just created new branches ahead of the master branch.. </p>
  
  <p>Thanks for your time..</p>