can you change secondary profession?

In Factions/Nightfall, can you change the secondary profession in Roleplaying Mode at any time like in prophesies?

Well, you can, but like Prophecies, you may only do so in towns, not while in a battle map. Also like Prophecies, you can't change your secondary profession until you reach a certain point in the storyline. Finally, in Factions and Nightfall, there aren't quests to let you learn new secondaries; there's simply an NPC that will teach you a new secondary for 500g (I think.)

Hope it helps,
Luny

Thanks a bunch.