ORD: Creating surfaces from corridors and merging into one final surface

Greetings and happy new year.
 
I am a novice at ORD and need direction.
I have created an existing terrain model from a corridor using a very simplistic template that is 500 ft. left and right of my alignment with a +2% cross slope (lower on the left side and higher on the right).
I created finished alternative surfaces using an canned four lane asphalt roadway template from the program library to create a second corridor, 
I complexed the finished alternative surfaces; then I tried complexing these finished surfaces and my simplistic existing terrain model.
If you can point to a Bentley lesson video or instruction would be great.
Thank you.
Jon