You can use the MOXF as a VSTi. This will allow you to open multiple instances of MOXF VST, each will have 16 Parts. If you need more than 32 PARTS you can open a third instance of the MOXF.

The workflow would be to create 1-MOXF VST and create your 16Tracks
Use the Cubase “Freeze” function to render a temporary audio files of what you’ve done thus far (this places your first 16 MIDI Tracks in a folder and MUTES them... ( this is consider freezing them”) instead of playing the tone generator directly, the temporary stereo audio file is used while you reuse the hardware as a second MOXF VST.

While you open a second MOXF VST (2-MOXF VST).... Create 16 additional Tracks
Use the Cubase “Freeze” function to render another temporary audio file for this set of 16 (again you MIDI data is frozen in a muted folder)

Now with the two FREEZE Audio files playing back, you can open a third instance of the MOXF VST and add another 16 MIDI Tracks...

You need to work with the “Yamaha MOXF6/MOXF8 EDITOR VST” - Downloadable from the MOXF Product Page at Yamaha.com

https://www.yamahasynth.com/forum/beginners-question-mofx-vst-and-cubase#reply-12991

Thank you Bad Mister..