File menu > Save Selected
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:
Ancestors of selected child objects are saved, all the way to the root of the hierarchy.
IK follow objects to which selected objects are bound are saved.
Procedure
To save selected objects to a new file:
Select one or more objects.
Choose File > Save Selected.
Enter a name in the File Name field.
Click Save.