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How can I revise an existing StormCAD model with a new C3D xml export?

I originally setup a big outfall for some preliminary analysis in AutoCAD C3D 2014 and exported a Land XML file and then imported that into StormCAD to make my model. My model has all of my alternatives, scenarios, etc. setup and the model seems to be working fine for the preliminary analysis. 

Now I need to update my model to match the revisions in C3D. I tried to export and new XML and bring it into StormCAD but when I did that created a new file. I really just want to revise my current StormCAD file for the changes and not have to go back and set everything up again to run it. Is there a way to do this without drawing over a dxf and manually updating everything? 

Thanks in advance for any help with this integration. 

James Eason, PE