@matthewnohr Thank you for your reply.
I was trying to use it as the vehicle to leverage a reusable library of functions that I can “include” in my Apps by simply defining it as a child App. Right now I have some advanced conversion and logging/debugging functions that I want in all of my SmartApps.
I have created a little app https://github.com/fxstein/smartthings-smartlib as a starting point.
I will add settings for level of debugging, external logging and other capabilities. In order to use them I could see this as a Child App so I can call its methods from the parent.
I understand its kind of a hack, but would allow me to leverage a re-useable set of code amongst multiple applications.