and here the manual info (p.696) 
Exporting and importing track archives (Cubase only)
You can export Cubase tracks (audio, FX, group, instrument, MIDI, and video) as track archives for import into other Cubase (or Nuendo) projects. All the information associated with the tracks will be exported (channel settings, automation tracks, parts and events, etc.). If you select the “Copy” option (see below), a separate “media” folder will be created, containing copies of all referenced audio files.
kind regards,
R.