You can add 2D sheets and 3D models from DWF, DWF(x), NWD, or NWF files to the file currently open in Autodesk Navisworks.
You can choose a source file in a DWF, DWF(x), NWD, or NWF format, add all of its sheets/models into the currently opened file, delete any unwanted sheets/models, and then save the multi-sheet collection in a native NWD or NWF file format.