Someone has already done this (as far as I understand what you're asking for) and shared some complex Fake stones setup inside a shader. I have no idea how to create something like that, but I just deleted the contents of this grouped shader and added a simple surface layer that's connected with the internal child input. Otherwise it seems you are losing the internal inputs. You can delete it later.
You can put any shader setup inside and everything looks tidied up (unless you open this grouped shader...)
