I've been trying to remove FBR and make all the line infantry mass volley. I've tried to get help on this site but no one will give me real answers. I have gone to unit_to_unit_abilities_junction and changed all the FRB to mass volley. (For the line infantry) That is all that I have been told to do by everyone that I've asked. But they still use FRB.
Can someone give me clear instruction?

PLEASE HELP!!