This multi-purpose wizard can be access from File > Export... or through a right click on a target folder.
The wizard allows you to save parts of the currently open model into a different file, database or repository (possibly in a different format). This includes the ability to save a database into a file (and vice versa), and to convert between XML and Turtle serializations.
The wizard displays all sub-graphs of the currently selected ontology with check boxes. All selected graphs will be added into the target file, for example allowing you to merge classes and instances. Depending on the selected output format, the next wizard page will provide additional options.