Create a new Endnote library containing the new labels

1. Create a new Endnote library under File [IMAGE png] New...
2. Choose File [IMAGE png] Import...
3. Select EndNote Import under Import Options in this dialog box.
4. Choose the file to import (e.g., output_refs.endn).
5. Import this file

Although you may of course add references to an existing library, it's probably a good idea not to add new references without properly formatted labels (i.e., don't directly download new references using Endnote's Connect feature; use an auxiliary Endnote library to do the download...export...convert process. Converted references can then be imported into the main library).

Note that Endnote reference numbering will be lost using this method (since there is no way to export the Endnote reference numbers).