you dont have to split it at all. when you enter the setup room do so only with the knowledge of WHERE your joints will be either by having split and re-attached within your 3dprog (line seperating one part from another should be thicker)... export all as one mesh. import all as one mesh. enter setup room. when you add your bones, keep within the boundries youve set. tweak and finess your bone structure inside your mesh until they all sit where they are suppose to. open the group-editor and click auto-group. it will screw it up. dont worry. from the NEW dropdown list of your bones, in the group editor, click each apropriate bone label and then take the rest of the day and night re-establishing the poly's to correspond to the bone they are suppose to be associated with. simple. exit the setup room and start in the joint editor. thats another post.