SPDCad got real close to what we do, so I wont type in all the duplicate stuff. Mostly, divide your work into what it is, and use a generic number for that stuff.(Generic term stuff, HAHA)
Like SPDCad, project number on the front, discipline, type, level, sub level
2440A210-proj 2440, Arch, Floor plan, Level 1, overall
2440A211-proj 2440, Arch, Floor plan, Level 1, Area 1
2440A212-proj 2440, Arch, Floor plan, Level 1, Area 2
A1 - General
A2 - Floor Plan
A3 - RCP
etc