Hello
Let’s say I have a tiling material for wood and metal. I want to create a new material that can just reference an existing material and use a mask to control where those materials appear. But I can’t find a way to make a material parameter (I just see parameters for textures and number values). It’d be great if someone could point me in the right direction in approaching this. Thanks! 
Hey,
What you’re looking for is a Material Function. Here’s a tutorial showing you how to combine different materials, which I think is what you’re asking for: A new, community-hosted Unreal Engine Wiki - Announcements - Epic Developer Community Forums
Hi thanks for the reply! I forgot to mention that I was looking for a way to instance something like a layered material. Where I would be able to swap out the layered materials any time with other existing materials. But I can’t seem to make parameters out of the material functions that A new, community-hosted Unreal Engine Wiki - Announcements and Releases - Unreal Engine Forums demonstrates.