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.
![Image](https://i.ibb.co/hD2STp9/nodes.png)
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.
![Image](https://i.ibb.co/4dC7pRT/render.png)
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.