Hello,
I use a NULL node to store global variables that I use in different parts of my network, like that: ch("../SETTINGS/layer_height").

I'd like to be able to store different configurations in various NULL nodes with the same parameters and switch between configurations by plugging them into the SETTINGS node and have the settings node inherit the parameter value from whatever is plugged in as a parent. In that case I don't know the parent's name (CONFIG1, CONFIG2, etc)

How can I access the parent node without knowing it's name, e.g. ch("../whatever is connected to input 0/layer_height")?

I solved it like this: ch(opinputpath(".",0) + "/layer_height")