When using Revit to design your Cable Tray, in many system drawings there is a need to differentiate between different types of Cable Tray elements in coordination and dedicated electrical drawings.
In AutoCAD this is achieved by using different layers and although we have similar methodologies in Revit via the System Styles where we can set colours and patterns by category, there is often a need to show certain items, like cable tray differently, even though they may be of the same category.
I was asked recently on a Revit training course "What is the easiest way to hatch cable tray in Revit MEP to indicate the different types of cable tray that have been installed on a project?" There are several ways this could be accomplished. You could simply use the Filled Region to manually hatch the cable tray, but whilst this is the simplest, it is tedious and time consuming.
The best method would be to use Phases inside of Revit MEP. You could set up some phases and change the graphics of the phases to indicate the hatching. This is easy enough, but almost an overkill.
The method I recommended was to just use View Filters. You can simply create a new filter and change the graphics of the filter to have the hatch pattern.