Want to save time in Navisworks when it comes to selection sets? Try exporting select views of the model to establish ready made "selection sets". We've already got natural organization with categories, worksets and filters doing some heavy lifting in our project. If we export several NWC files with just things like all the plumbing, HVAC, furniture, fin tube radiation, medical equipment, and so on, we'll have separate ready-made selection sets. Further finer grain selections can then be made by focusing on the separate files within Navisworks, if it's even necessary.
Sure that's what Navisworks is good at, selecting and searching for criteria but things are already pretty organized in a Revit model. Seems a waste of time to export a big pile only to want to break it down into smaller piles inside Navisworks? Want to run slash detection on pipes and ducts, just pick the two separate files as soon as they are loaded. If information doesn't get sent to us like this, we can just ask. If it still doesn't then we've still got Navisworks search ans selection sets in our back pocket.