Ok i made my model with 3d Max, I exported it as root.xsi, i put _humaniod.gla into models/players/_humanoid folder and put the root.xsi into the player/character folder. then i open Assimilate. add file and put the humanoid.gla in and i hit build. it makes a model.car but and error says build failed and could not spawn process. what i need to know is, is that ok for that error to come up, and how do i turn this into a GLM. im so confused, could some one help?

Probably something wrong with your model's hierarchy or weighting, I would ask at the LucasForums modeling forum, you'll get more help there.

Also do you know if u need to add like sub part to the heritacy, like head_helmat or torso_accesory?

I have no clue, go to LucasForums.