It's not what you would normally think. I want to know how to blend materials to have their own settings like metallic glossiness, roughness, things like that. I used to use 3DS Max and the way it blends materials is by using a black and white texture map like so.
Here's the diffuse texture
And here's where I would want to put different material settings on the parts of the texture.
And here's what the model looks like
Would this be possible in Blender?