I think there might be a post on this somewhere else in the forum. Anyways I also use crossover and it took me a while to figure out too because it is a pretty convoluted path. This is where all the important files for the game are hidden in my hard drive:
Macintosh HD, Library, Application support, CrossOver Games, bottles, setup_baldurs_gate, drive_c, program files, GOG.com, Baldurs Gate, Characters.
I have no idea if this is normal for other people but hopefully this is helpful.
Then just copy your character file into your BG2 character folder.
Post edited June 23, 2013 by ewill88