We don't have Navisworks in our office so I don't have a way to test this out.
After exporting a model from Revit to Navisworks, is there any way in Navisworks to see how the objects were phased in Revit? For example if a duct is, in Revit, created in Phase 1, after exporting the model to Navisworks and opening it up will you be able to know what phase the duct was created in? Or do you need to do something else like separate worksets for each phase for this information to carry over?