Currently Writer supports one centralized database, or per-document databases for bibliography. There is no tools to move, copy, or merge entries from one database to another. Please provide some tool to manage/merge multiple bibliography databases. A tool to print the complete in-document bibliography database is also missing IMHO.
great idea!
To manage your bibliography databases, you should use an external tool like Zotero (free and open-source). Since several years ago, nobody want to work on an improvement of the bibliography tool. In the old time of OpenOffice.org, the project was to remove this internal tool and to connect to Zotero. But nothing has been done. So I think it is not a good idea to wait for an improvement of the internal bibliography tool. Feel free to reopen if you know somebody who plan to work on this. Best regards. JBF