Just a thought, and it's an ugly one.
You can make a profile from a text file. Find the format in help. Output
from Excel to that format, then use that profile to drive a corridor with
just those PIs and no real sections (a marked point only corridor, one of
Dana's faves.) Set the sampling interval really high, so that is just hits
the PIs, and build from the feature line basically. Just a thought. Then you
just have to export a new txt file every month and hit update. Probably not
much less work than the manual update to be honest.
--
James Wedding, P.E.
Engineered Efficiency, Inc.
Civil 3D 2007
XP Tablet, SP2, 2GHz, 2G
www.eng-eff.com
www.civil3d.com