Hi Niall,
We do allow export of Navisworks files to FBX but unfortunately we don't bring through any animation settings or appearances at this time.
If this is something you would like to see please log an enhancement request here with details of what you would like to be able to do.
If you are exporting to FBX, a quick tip, simply hide any objects in Navisworks you don't want to bring through to 3DS Max
I hope this is some help.
Lee Mullin
Construction Technical Specialist
Autodesk Ltd.