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The most efficient way that I can think of would be to export the data from Navisworks as XML then consume that file inside the AutoCAD application to create saved views, objects, and/or custom data via XDATA or Extension Dictionaries/XRecords. I've done this quite a few times with other processes, both with LISP and managed dotNET.
There *might* be another way, providing Simulate or Manage is installed on the same computer as the AutoCAD application and using the Switchback function in Navisworks. I've had limited success with the Switchback feature (mostly using the NWNavigator plug-in) but not enough to warrant further attempts.
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