How to assign multiple MIDI channels from an Omnichord to separate instruments in MainStage?

Hello, I am new to MainStage, I have read the pertinent sections of the manual but can't seem to be able to figure out how to do the following:

I would like to use a Suzuki Omnichord's MIDI output in addition to a MIDI keyboard.

The Omnichord is capable of sending 5 separate midi channels at the same time - 2 for the strumplate, 1 for bass, chords and drums each.

What I would like to do is trigger 5 separate instruments for each channel.

If I start with "keyboard minimalist", which has the electric piano as the single instrument, where would I add the additional instruments to map to the midi channels? Do I need additional instrument patches, or additional "channel strips" within the single patch, or something else entirely?

Thank you in advance!

[Re-Titled by Moderator]