Issues with using multiple AS3 Json Files

AS3 is a declarative interface, meaning each json file (or tenant) needs to have all the required pieces every time, to delare the end state.  You can reference objects in /Common/Shared, but they would need to be deployed via another JSON file like it's a separate tenant before they can be referenced.

I have seen some instances where customers use tools like TF to build the declaration from templates and/or defaults, but then it all gets sent as a single declaration/API call