Welcome to the forum!
Can you please let me know - are you an end-user or a Crestron programmer/dealer? Adding more zones is possible, but the SIMPL source code must be changed to accommodate the additional zones, our sample module only contains 4 zones.
This is quite a technical change in the SIMPL source code and if you are unfamiliar with Crestron SIMPL programming, I would suggest reaching out directly to your Crestron dealer/programmer to make the changes to accommodate the additional zones required in your setup.
It’s best if I provide the overview of the changes needed directly to your Crestron programmer/dealer because as I mentioned, it can be quite technical and it will require access to Crestron programming tools to perform the changes.