Drag points to edit terrain

How can I edit terrain by selection a point and dragging it up or down? I realize I can achieve the same thing in multiple steps using the paintbrush, but it would take way less time and be more precise if I could just click and drag.

Thanks for any help, or if you can direct me to a similar question. I’m sure it’s been asked before but I’ve spend quite a bit of time searching with no luck.