Pretty sure it's not possible but a cool idea anyway...
If I'm listening to music downstairs and want to move upstairs, it'd be sweet if you just say something like "alexa, move upstairs" (where upstairs is the name of the upstairs echo).
Obviously you can just say stop downstairs and then play upstairs and it'll pick up where it left off... but would be fun to have it understand a move or tansfer or whatever command like that.