Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Mods Transparent Terrain

I can't seem to find out how to paint a texture onto the terrain to make it fully transparent. I know it's possible because I loaded up the Main game files and saw a few examples of it, but couldn't see how it was done.
What I'm trying to do is use the Dungeon Floor Gratings, but there's no way to prevent the terrain clipping through the model, unless it was transparent.
Any help is appreciated, thanks!

the cut terrain button maybe? it's the scissors icon next to the terrain modifiers. I was able to paint over the transparency it created.

I can't believe I missed that. It's exactly what I was looking for, thanks!