Can I add my own systems to the list of systems that pop up when you click on the + on the HVAC tab?

I know I can just write a measure and use "apply now", but this is less convenient, and I'm curious.
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Can I add my own systems to the list of systems that pop up when you click on the + on the HVAC tab?

I know I can just write a measure and use "apply now", but this is less convenient, and I'm curious.