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Sorting the objects in Navisworks based on Properties such as System Classification or System Type as assigned by Revit MEP is a common practice.  The sorting is used in Clash resolution as well as Timeliner and for visualization.  However, at times even the System sorting is too ‘comprehensive’ and since the model was organized by Worksets, why not use Worksets then as our Filter property?  Be prepared to analyze your Workset data in Navisworks to determine what the appropriate value to filter will be.  The Navisworks exporter from Revit converts the Workset data to Integer values.  For an example, the default Workset1 “appears” to always come over as the integer (zero).  (NOTE:  I wrote ‘appears’ because, so far, every test I have done it has set the Workset1 to the integer zero.  But I don’t want to say it will do this each and every time, until such time that I am convinced it will.)For my examples below, I have an NWC written from RMEP with the standard worksets: Shared Levels and Grids –and- Workset1.  While in the ...