OpenRoads End Area Volumes "Excavation Limits" ?

On a typical RRR project where part of an existing roadway is to be milled and part saw cut and removed for improvements purposes, how can the new OpenRoads End Area Volumes tool be set for excavation limits of unsuitable material.  The material to be excavated is defined on a single level for existing pavement.  Is there a way to define excavation limits similar to the old GEOPAK Earthwork tool?

 Please refer to the images below:

  1. Cross Section, no Earthwork delineated

  2. Cross Section, Earthwork with unsuitable material by level from the OpenRoads End Area Volumes tool

  3. Cross Section, Desired result! To get this result we had to break the existing pavement into piece/levels.  Very tedious task.

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