Alright, so usually, when I want to carve an area out of the map, I just use a delete sphere, or something, etc.... however, if I color the delete sphere blue, it'll not only color the part where the water is blue, but it will color the cliff leading down to the water. Is there like a faster way to color stuff or something?

I've made 3 layer water on 63, dirt on 62-40 something, and then one layer of grass, it would work perfectly if I could transperantly remove an area, is that possible?