I was working with the new pressure pipe features in Civil 3D 2013 and I realized I wanted to do something: I wanted to create a profile that represented 3.5 feet below my existing ground profile. I thought - simple, I'll just use the profile copy command to copy it and then drop it down 3.5' Not going to happen with a surface profile - most of the commands are greyed out, including the ones I need.
So - what to do? Turns out you can temporarily change the profile from dynamic to static, make the copy, then change it back to dynamic. The link below is a video showing what I did.
After doing this, I realized that I could have also made a "Cover" surface by creating a new surface, pasting in my EG, and then lowering it 3.5' Then I could sample the Cover surface and show it in my profile view. Actually a better solution since it will work anywhere - meaning I can move the pipes and alignments around and the "cover line" will always be accurate. This solution is shown in the link below: