I haven't been able to find the answer to the extremely important question ANYWHERE including on all the noobie guides out there.

So, I have like 10 Archer Somas.

If I combine my level 50 one with my other 9, Her unit cost will decrease by quite a bit however lucky I get. If I'm wrong on this please correct me.

HOWEVER, does this CR carry over after Class Evolution? Did I just waste 9 silvers for nothing? I haven't been able to find the answer ANYWHERE. Do I have to Evolution all my Somas and then combine them?