Special Ditches

Has anyone had success yet with implementing Special Ditches into Corridor Modeling yet?  Basically, what we want need is to able to:

1) Set a ditch profile in GeoPak

2) Associate the ditch profile with a specific chain/corridor

3) Have Corridor Modeler determine fill slopes based on PPM Table 2.4.1 in relation to the elevation of the outside travel lane to the elevation of the ditch.

4) Have Corridor Modeler determine horizontal where the special ditch bottom is located on the cross section view.

5) Run slope stakes in plan view to determine where the ditch bottom along the baseline.

We don't want to have to determine where the ditch bottom in plan view is first.  That defeats the purpose of using Corrdor Modeling.  We spend a LOT of time doing handwork on the cross sections to draw in where the ditch is due to different profiles between PGL and Special Ditch. 

Basically, where we are currently hung up on is how to associate a specific special ditch profile stored in GeoPak to a baseline chain that already has a PGL profile associated with it.  We can't get one chain to have to different profile associated with it.

Can anyone help us out? 

Thanks!