Terrain Paint Studio allows you to create separate layers for painting on your terrain, and it saves these layers so you can apply/remove them as needed. This is especially powerful with procedural workflows where you can allow a procedural tool to paint your terrain for you, then apply your custom touch-ups and polish where you need it. For example, if you need to paint a road somewhere, apply it as a layer on top of the procedural layer and you will never lose it even if you need to apply procedural painting again.