Parcels rank with grading (and I do mean RANK) as the least mature functions of Civil 3D. It sounds like you may have gotten further than I did with them, congratulations. If I understand what you are trying to do, you may have some luck with the reporting feature for parcels that does work rather well if you can get them established. The reporting should be addressable with a right click on the parcels within either the drawing itself if they are being displayed or from within Prospector at any time.