Bazaar defines several aliases for locations associated with a branch. These can be used with most commands that expect a location, such as bzr push.
The aliases are:
:parent the parent of this branch
:submit the submit branch for this branch
:public the public location of this branch
:bound the branch this branch is bound to, for bound branches
:push the saved location used for `bzr push` with no arguments
:this this branch
For example, to push to the parent location:
bzr push :parent