Are you just talking about the profile, or the horizontal alignment?
If you're just talking about the profile, after you insert the subassembly
for your lane, and it attaches to the node on the Assembly, simply move it
down by the required amount before using it in your corridor.
If you're not running an alignment down the CL, AND you have to deal with
offsets, then I think Nick has a better solution.
--
James Wedding, P.E.
Engineered Efficiency, Inc.
Civil 3D 2006 SP2
XP Tablet, SP2, 2GHz, 1.5G
www.eng-eff.com
www.civil3d.com