I'm not very sure if its called "cutting them" but i need help removing something such as Revan's mask from the robes or removing the helmet from Mandalore to put it on as a seprate item. How exactly would I do this, and what tools do I need?

Unfortunately it's not possible to cut various bits of an item like in the way you're describing, you'd have to model something new. To do that you'd need gmax to make the new model, Photoshop ($$$ after the 30-day tral) or GIMP (free) to make the skin for it, and Kotor Tool to do more minor things like making the template for it.

Ahhh thats hard... I can't make models, soo thanks...

Edit: I can use the models as a templete though right?