In Creo 8, you can insert multiple models from the Assemble Multiple Components dialog box into the tray assembly in a single step. It is useful when you want to print multiple instances of the same part or assembly in one tray.
To learn more about what's new in Creo 8, please see: http://ptc.co/RAb730qr0d2
Try the latest version of Creo for yourself: http://ptc.co/KDha30q96py