Perhaps you would like to have a subset of Biblio from the collection, such as all of the Biblio from a particular author, or perhaps all of a certain type of publication.

This is easily done by using Biblio's built in filter tools:

From the Biblio list, click on the Search link, then within that, click on the Show Only Items Where link.  This will open up Biblio's filtering tools.  For the purpose of this demonstration, we'll filter based on an author's name, which is selected from the Author list.  After the selection is made, click the Filter button.

You should now see a list of Biblio entries where all of them have that particular author present in the citation.

To export this into a file, follow the export instructions in the Export Biblio article.