Use the Linework tool to quickly change the line style for selected edges of model elements in a view. 
For example, you can use the Linework tool to 
- Differentiate cut edges and projection edges of the model 
- Hide selected edges (by applying an Invisible line style) 
- Reveal edges of elements that exist in the model, but are hidden in the view 
- Differentiate the edges of a building in an elevation view 
- Differentiate edges in an imported CAD file or a linked Revit file