One very strange thing in Revit is why the programmers left 2 different methods of hiding things. If you hide things with the "glasses icon" > hide element or category, those objects hide, but, print, and they cannot be reset to visible again using the "reveal hidden elements" mode, which is confusing. If you don't want them to print, you need to use the "Glasses icon > "Apply..to view"
On the other hand, if instead you just select the object(s), do Right click > Hide by element or category, this method hides the objects permanently, without the risk of printing them, and without the need to "Apply" , and they can be reset to visible in the "reveal hidden elements" mode, so all about this method is an advantage over the first one. I thought 2010 would unify these two behaviors to avoid confusion, but it did not. In my opinion, the first method should be either removed or revised to work like the second method.
Alfredo Medina
Alfredo Medina _________________________________________________________________ ______
Licensed Architect (Florida) | Freelance Instructor | Autodesk Expert Elite (on Revit) | Profile on Linkedin