Hi, I would like to use a material instance inside another material graph. Is this possible? Thanks.
No, not possible.
You can have a material function though and use parameters for the input variables in the function, that will be almost like having a material instance inside a material.
Yes this is what I am planning on doing, but this is not handy. I am going to request MI to be part of graphs as a feature request.
You can also use this: Material Parameter Collections | Unreal Engine Documentation