Save Selected saves the selected geometry as a scene file under a different file name.
Identically named bitmaps with different properties are stored as different files. Objects linked to a selected object are also saved. The following dependencies are preserved for a Save Selected operation:
To save selected objects to a new file:
Select one or more objects.
Application menu
Save As
Save Selected.
To save selected objects to a previous version:
Select one or more objects.
Application menu
Save As
Save Selected.

See Save As Previous.