Deform Terrain With Mesh

Hey community

Just wondering if there is any way i can make a part of my terrain match a mesh object. Basically i want to make a nice slope in the terrain and i cant get it right with just terrain tools. Can i make a plane above my terrain and make the terrain match its mesh so i have a perfect down slope?

Thanks in advance

Edit 1

A good example of what i want is what easyroads does to the terrain, but instead of using a road object i want to use a plane object