When you import or link a file to a 
  Revit project, you can control the graphic display of file layers in all views. 
- Open the project. 
- Click Manage tab Settings panel Settings panel  (Object Styles). (Object Styles).
- In the Object Styles dialog, click the Imported Objects tab. 
- Click to expand the DWG file name of the file. 
  Revit lists the layers in the file. 
   
- For each layer, change the values for Line Weight, Line Color, or Line Pattern, as desired. 
- Click OK.