The reason I would like to be able to do this is that I'm a novice Revit user. I am using a students version of Revit 2017. I took a class on Revit and used "Revit 2016 MEP Fundamentals" by SDC Publications. All of the work and features I used were based upon generic pipe. For example, converting pipe from generic to another type of material doesn't work on fabrication pipe- at least as far as I have tried. This makes me wonder if I'm looking at the limitations of my knowledge, asking the software to do something it can't do or, not asking the software in the right way (i.e.- strategy). I am a plumber and work in the construction field. I don't need to have the plans show realistic portrayals of the pipe since I already know what material we are installing. It is useful to be able to color code the systems like what is done initially before I translated it into fabrication parts. In other words, it seems that you can do some things with the model in generic pipe that you can't do with fabrication pipe.