the milling work center visibility

Hello,
How can I make the machines I have visible in the milling work center assembly tab in the milling environment? I have machine assembly files downloaded from Grabcad and from this link (Article - CS314559 - Information about Tool motion Simulation and library of Basic machine assemblies to show Machine Kinematics within Pro/NC). Many CAM software programs show machine movement, could you help me with how to do this in Creo?