Hmm, thats a good idea. but is it possible to boolean a terrain with a object and have the terrain remain a terrain not get converted to an object?

The scene I was looking at has a terrain with a shape imprinted in it such as the picture I've added to this post. then it appears to be a grid shaped to the imprint.

I think I might have figured it out but will have to test the theory.
I'm thinking draw the terrain then export the terrain as a map then import the map as a backdrop in the vertex room. then I should be able to modify a grid or something to the shape of the backdrop.

It sounds good on paper anyhow, guess I'll test that theory and see if it matches up back in the assembly room.