Node links with layered graphs? How do I use these?

I started to use layered graphs for my multi story levels and everything works ok. My levels have both stairs and manual elevator. I was trying to get my AI to consider the hole in the elevator roof as a “shortest” path option but I cannot figure this out. All I want to do is allow the hole to be considered as a link between the 2 floor graphs.

I have looked at Node Links (no 2) but that doesn’t seem to be working for me? I assume you put one GameObject with NodeLink2 on it with a second destination GameObject (has no NodeLink on it) as the ending node for the first object? does this then get included in my Layered Graph? right now it doesn’t seem to join together even in my small test scene so I am not understanding how to use NodeLinks.