To save the content of the 3D views simply use the menu option File/Save Project or the corresponding tool in the toolbar. When the project is saved in a .gvp file all the properties corresponding to 3D view are stored in that project file. In the project it is also saved the bookmarks list defined for the 3D view which could be used in posterior sessions.
To retrieve a project where there are saved 3D views, it is only necessary to use the File/Open Project menu or the corresponding tool. The 3D views will be restored to the position in which they were saved, including the layers and extent.
