The user can create a joint group entity as follows.
• Point, Point
• Point: Selects a point on a base body.
• Point: Selects a point on an action body.
• Body, Body, Point, Point
• Body: Selects a base body of cmotion joint.
• Body: Selects an action body of cmotion joint.
• Point: Selects a point.
• Point: Selects a point.