Make sure VAVs have a ref to their AHU they serve.
Create program that runs on VAVs and add points to use. That's it and save it, no logic done here.
Create program that runs on AHUs and make sure to include bundle when selecting points to add when creating program.
Create the logic you want. Like getting the total VAV count, avg, min, max of VAVs. Or if any are X, do this or that etc.