Thanks for replying. My problem is the following, perhaps there is another way:
I have imported a static mesh (a spaceship) with 50 material instances with different textures. The instances have the same master material as parent.
Now, SOME of the instances (about 30) have to be metallic (the exterior of the ship), and the other 20 have to be non-metallic (some of the interior).
I am trying to see if I can make 30 instances metallic at once, without manually opening each of them and changing the metallic parameter.
I thought about using a Material Parameter Collection, but it affects the ENTIRE parent material (meaning, all 50 instances, which doesn’t help).
So I thought I would change the parent of the 30 instances (at once with a utility) and use the Material Parameter Collection only to the second parent, thus affecting only the 30 instances.
This seems like a lot of work for something that should (?) be way simpler…