You can subdivide an NC program into several channel lists that are executed simultaneously on the machine. A channel list controls individual devices on the machine.
You define all available channels in the Machine Tool Builder application using the Channel Definition dialog. Assign devices to channels using the check boxes in the dialog.
Where do I find it?
Right-click on component in MTB → Edit → K-Component → select component that is classified as device holder → Channel
See the Integrated Simulation and Verification documentation for more information on defining channel, device and device holder in the Machine Tool Builder.
See the Manufacturing General documentation for details how to define tools and devices in NX Library so that they can be correctly mounted to the machine.