We will always work in the view pictured unless stated. Pictured above are the blends we will be making. Ok Lets get started. I only show this image because I want to point out that there is more than one way to do things in Rhino. Ok, now, lets get started.
Lets start by making a complex surface to blend to.
Note the size. Make it the same size as shown here. Place this cylinder 2 inches up from the cplane and 2 inches in from the right side or the surface like this. In the top view, adjust the cylinder so it crosses the surface like this. Now that we have things set up, It's time to start the blends.