The idea of assigning a Parent Instrument and Patch to a Track is to make the Studio Module aware of how that Parent is made up. But this might not always be necessary. Some devices always receive on a fixed set of MIDI Channels, for example 1 to 8 or all 16), and when you turn them on they are always ready to receive on these MIDI Channels.
If you have such a device, you might forget about using Parents. You can just set up a number of Tracks and assign Child Patches to the MIDI Channels in the device.The same can be true even if your device has "assignable MIDI Channels" (as above). Just create a Parent Patch manually within the device that receives on a fixed set of channels, and make sure the device always has this Patch ready when you turn on power. This way, you will always have the same set of MIDI Channels to assign Child Instruments/Patches to.