Now the following is possible:
Turn
C:\Music\ABBA
into
C:\Music\ABBA-The Hits
or
C:\Music\ABBA
into
C:Music\A\ABBA
while moving all other files.
What's not possible is
turn
C:\Music\ABBA
into
C:\ABBA
Here's written how to do it: /t/3499/1
\ can be used to create a new subfolder