I have many objects all with the exact same base metallic "surface". Some of the objects require small simple variations in bump and displacement.
Is it possible to have color, metallic, roughness, etc. (most of the principled BSDF) in a single easy to change material and then have different materials for various changes to bump and displacement?
Could this be done using an addon or "data transfer" of some kind? A modifier? Or maybe something I haven't learned yet within Blender that would accomplish this? Basically some way to "layer" or "add" materials. The same metal material for 10 objects and then each object has another material adding bump or displace texture.
Another comparison would be something similar to "Duplicate Linked" with objects. They are the same at the "base" but you can make all kinds of changes to each "copy" but still edit the original for global changes.
I am trying to avoid having to change a common base property of a bazillion objects. I know there are other similar questions on here asking how to globally change the properties, but since I am "at the beginning" I don't need to change anything yet, and would like to start from scratch with a better solution IF it is available. I am fully prepared to simply use multiple duplicate materials.