You Can Flatten a DWG Import while Maintaining Layer Structure and Components I found this on the SketchUpEssentials YouTube page (Thank You Justin). Basically Fredo Scale, BoxScaling Scale in Z axis and Type in Scale Factor of ‘0’ Zero https://www.youtube.com/watch?v=NeZ5ElXBB-0
You can always just use drape from the built in sandbox tools. Note that I unsoftened the edge around the sphere because it sometimes has problems with soft shapes.