Character/Class help on RM2k3/XP

I need a little help here. Is there a way to change a character's class to an advanced or better version of that class when they reach a certain level, like on the Fire Emblem series? For example, on Fire Emblem, an archer, when it reaches a certain level, turns into a sniper. Or a cleric turns to a bishop. Or a cavalier turns to a paladin. Is there any way I can do that on RM2k3/XP?