When you install StormCAD after you install AutoCAD, integration between the two is automatically configured.

If you install AutoCAD after you install StormCAD , you must manually integrate the two by selecting Start > All Programs > Bentley > StormCAD > Integrate StormCAD with AutoCAD-ArcGIS-Microstation. The integration utility runs automatically. You can then run StormCAD in AutoCAD mode.