I have some bvh and want to import it into to a character in motionbuilder. I can import the bvh but HOW DO I PUT INTO THE CHARACTER SO THE CHARACTER CAN PERFORM WHAT ITS ON THE BVH.

hi
you need to do several steps :
1- you should skin your character in yoour main application (maya or 3dmax) and export the character and the rig as fbx
2- import your character to motion builder
3- characterize it and activate the character in motionbuilder
4- import your bvh file
5- characterize your bvh rig (it should be in T pose)
6- on your main character’s properties choose character input as source and choose your bvh character as input
7- now your character should follow the bvh
8- on main character’s properties plot the animation and choose skeleton
9- now you can delete your bvh rig and character and save the file
10- import it in your main application. if you done everything correct your character should have the bvh animation.
11- now place your character in scene and have fun :D