Are you asking for a tutorial on how to use Deform tool to deform the terrain?yes...About this: Part II: object splines video tutorial
In this part II of the video tutorial you'll learn more about the object spline mode. You will learn how to place splines of multiple separated objects, like bushes, and how to distribute or orient them with respect to the spline.
You will also learn how to place wall splines and how to edit individual spline segments.
In the end you will learn how to combine different spline modes into a single spline.