That's what --remember is for (bzr help push).
So you want 'bzr push --remember target2'
The most common way to use 'bzr push' (which you already know) is to use it without a location, when you change your mind, you tell bzr to remember that.
That's what --remember is for (bzr help push).
So you want 'bzr push --remember target2'
The most common way to use 'bzr push' (which you already know) is to use it without a location, when you change your mind, you tell bzr to remember that.