Scripts to change levels

I am looking for a better way to process large surveys.   When I order a survey it will be delivered as a .dgn file which is great but with AEC CADD standard levels. V-Levels for existing features.  I tend to do a lot of work for the Department of Transportation and their preferred levels would be pho. levels or photogramic levels.  Is there  currently a  script or  a mdl app that would read my survey file and change levels from V's to pho. so lets say it will see in the file a V-BLDG-OTLN  and change it to a phobldg level. Any advice would be appreciated.