Open a 
  Revit model, and use the Import CAD tool to import vector data from other CAD programs. 
If you want to import 3D geometry using SAT or 3DM files, see 
  Import a 3D Shape. 
-  Click Insert tab Import panel Import panel  (Import CAD). (Import CAD).
- In the dialog, for 
  Files of type, select the desired file type. 
- Navigate to the folder that contains the file to import, and select the file. 
  Tip: Make sure you import the geometric data needed for the 
	  Revit capability that you plan to use. For more information, see 
	  About Imported Geometry. 
   
 
- Specify options. 
  See 
	 Import and Link Options. 
   
- Click Open. 
  Note: If you open a DGN file, the Select View dialog displays. Select a view to open. The view corresponds to the MicroStation view and imports into 
	 Revit exactly as it appeared in MicroStation. 
   
- If you chose to manually place the imported data, it displays in the drawing area and moves with the cursor. Click to place the imported data. 
 
You may need to zoom in to see the imported data. See 
  Zoom the View.