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In the past I have had to help several clients clean-up, break-up, and troubleshoot Revit models. With my focus being on RMEP, this entry will be from that point of view. Breakup by DisciplineThe process to break up a Revit model is about the opposite as to what we would do in AutoCAD. AutoCAD has a WBLOCK command; Revit does not.  So, take any RMEP model, we will call it ABC_RMEP.RVT, that contains all disciplines. Open the model, SaveAS, for example: ABC_PLUMBING. Now the fun begins. I will make a 3D view and then using the Visibility Graphics, I will turn off all the objects related to Plumbing. You may ask now, what about pipe? Depends, do you want to have only the Plumbing Pipe in the Plumbing model? If so, then use a FILTER that will sort out the Plumbing Pipe, leaving the Mechanical/Hydronic Pipe “on” for selection/deletion. Once the other disciplines have been deleted, issue the PURGE command and selectively remove anything that isn’t Plumbing in nature. Save the file again. Lather, rinse, repeat for the remaining disciplines.Once all the discipline specific files ...