Looking for approach to model retaining walls

MicroStation is our CAD platform on a project whose scope includes modeling all proposed retaining walls.  We've used LEAP in the past to model bridges, and InRoads to model face of wall, but we'll now need to go into more detail.

As is characteristic with retaining walls, the alignment follows a roadway, but its elements are very different from roadway, so I'm looking for a tool(s) to best suite modeling this type of structure.

Any suggestions?

-Christopher Johnson (christopher.johnson@ch2m.com)