You may create ("embed") a shared workspace inside a workspace using  File    Share    Invite Member   or using  Public Access   from the folder's action menu. You may transfer (  Cut   and  Paste   ) a workspace into another one.

The the members of the higher-level workspace (its BSCW group) are automatically added to -- or removed from -- the members of the embedded workspace (its BSCW group): embedding a workspace in another one, or removing a workspace from another one, automatically changes the membership of the workspace that you transfer. Remember to check whether these automatic changes are what you intented and correct the membership (see section 4.5) and the access rights (see section 4.7), if necessary.