Hello,
Are you talking about decal nodes ? They only work with Iray. They do not appear in Octane either. I'm having a similar problem and I partially solved it, but I had some issues with it.
I wanted to add a wound to a skin texture. so I took the nodes from the imported decal and added them in the skin shader, with a mix material and a 2D transform node for the maps to place and resize it. Finally I added a Mix Material node with the transparency map as the weight to mix it with the skin. While this looks good on a sphere, the wound doesn't show on the G8 character.
Here is the node setup that I used. The top half is the auto-import of the skin. I'll work on that later. The bottom half is the wound and the transparency map used both for the wound and the mix.
Here is the result, on a sphere and on the actual character. As you can see the wound is visible on the sphere but not on the G8M.
I have no idea how to solve this, and I really hope it's an error on my side because seeing how updates are currently pushed for the DAZ plugin, we're not there yet.