I can't seem to find anything about this in the rulebook. In WFRP3 it was pretty common to pretty much "finish" your career and then switching to a new career. For example going from a Soldier to a Veteran. Or switching to do something different, for example going from a Thief to a Student.
I realize the Genesys career are not as specific (unless you make them so) but even if your careers are just basically D&D classes I can still see a player wanting to transition into a different career.
Is there any rules for this? Or any suggestion on how to handle it? I'm thinking simply having the change cost some exp.