I don’t think it’s possible, I use a plugin Part to Terrain - Roblox
To revert it, simply just use the terrain editor and erase, just use that way instead so you can always choose between bricks or terrain. If you’re in that situation with the terrain already there but no parts inside, then I don’t know to be honest.
Yes I know, but I’m suggesting next time just use part then terrain first, so this situation wont happen. But yeah, is there any plugin or script that’s possible?