This may have been asked a lot but I’m going into details here.
I already have one channel set up but, I want to take this further by basically painting another material around the black texture.
What’s the proper way to use the other channels?
I’m trying to understand. I have to get rid of my diffuse texture for this? How would keep my current setup?
No, you just need to use the Attribute node and Col.001 etc
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Looking from the images, I just use another Attribute node and…?
Hi there!
Sure, as Joseph says. You can simply create another vertex group, and paint selecting that one.
The name of that new vertex group you will type in another Attribute node 
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What I mean is that considering my setup which I’m using a “Mix Shader” for both my BSDFs how would I use both attribute nodes if one of them never shows up in the render? I’m terrible sorry for sounding so confusing since I’m not deep into using vertex coloring methods.
Thing is I just need to understand how to use and where to plug in the second attribute node. Here’s my material setup.
As you can see, the bottom material set is used for me to paint on the black textures. On top is the original textures for my character. In the middle I have my one attribute node with a mix shader. I understand having different group names
It seems generally fine. Now, you either have multiple vertex groups, only BW channels for example, and use the names as attributes, and multiple mix shader nodes.
Alternatively, you can use R G and B colours in a vertex group, and then a Separate RGB, as you did above. The three colour channels will basically be different, separated masks, then you can stack them up with the mix nodes, where R then G and B are the factors.
You can actually do it with a MixRGB solution inside one shader, but masking is then more complicated.
Check this video from 15:30:
I hope it helps 
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Thanks, I’ll check it out.
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