>>8653101
Conditioning (Set Mask), it's a built-in node. It takes the conditioning for one area, and a mask telling it where the area is.

If you're also using controlnet then the whole mess together would look like this: https://litter.catbox.moe/jnsdso5o9352yq46.png
I use the mask editor built into Load Image node, you can just right-click it with an image loaded.