How to change the tracking branch?

[nelsyeung]

Is there a way to change the tracking branch?

Some examples of usage:

1. When I branch off based on a local branch, there's no tracking branch, thus one cannot push that new branch to remote, so I'll need to set the tracking branch.
2. When I branch off based on a remote branch, the tracking branch is automatically set to the same remote branch, this is quite useless as when we branch off, we are most likely to want to push to a new branch, but I don't know how to change the tracking branch to a new branch.