Its raining in Waltham. The building energy program has increased the lighting a bit to compensate for the gray day outside. Perfect atmosphere to compose and share a Revit tip.
The line work tool lives here on the Modify Tab in 2011 (similar for 2010).
The tool simply allows you to change the view specific style of a model edges (cut or projection) to a line style different than the one assigned to the category. Common uses may be to increase the weight of specific lines or eliminate them by choosing the style <Invisible Lines>. To set a line back to its default you choose <By Category>.
A neat trick first proposed by the developer that implemented the tool way back in the day is to use the line work on lines from other views displayed via underlay. I'll demonstrate on this simple model.
In the Level 1 view I'll set the view underlay property to Level 2 so I can see the roof.
The lines from the gable roof ridge and eve are now displayed. Using the line work tool set the line style to <Overhead> and click each of the eave lines.
This will cause the edges to appear in the overhead style (dashed). Next turn off the Level 2 underlay and note that the view specific line work remains. The line work is not just visible but is still referencing the original edges even though they are not displayed. When an edit affects the roof the overhead lines will adjust automatically.
Other overhead elements such as slab openings, balconies, lighting, and soffits can also be referenced using this line work technique. Give it a try.