Dynamic Piping for Animations

Hi,

CREO 7.0.

I am working on a robotic arm with piping on the inside. The arm is constrained using pins, so I can free move the arm as intended. I added planes/sketches on the arms and created pipes using the pipe application. When I move the arm, the pipes are stationary until I regenerate, then they update into the correct position. I am creating snapshots and regenerating after each instance so that I can create an animation. When I work on the animations, the arm is moving, but the pipes are not. How can I fix the model so that when the arm moves, the pipes move with it?

Thank You,

Alan