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

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