1. Yes, at least on a NEW file
Open RB, make sure the 'Chords' checkbox is enabled. Copy
Open a NEW file
paste the Chords in .. seems to work here.

2. Audio tracks are Audio, they won't transpose as you are expecting without regenerating (they are audio after all).
So you need to change the chords then regenerate the audio, or if you want to keep the same exact parts highlight the audio section and use 'Edit-Audio Effects -Pitch Shift' to make the existing Audio shift key.

Note this is a Hard Write process, so it actually rewrites the track's audio data. You can use Undo in the same session to revert, but if you Save it and decide later you don't like it, you'll have to do it again later to fix it.
Once you save the changes this way, they are permanent.
Unless I misunderstood the question


Make your sound your own!
.. I do not work here, but the benefits are still awesome