When you select Format Paper to display a Citations window, EndNote includes an output style list to confirm or change the style that should be used to format the paper. It also gives you the option to change the starting number for your citations and bibliography.
If you would like EndNote’s numbering to start with a number other than "1" for the document that you are formatting, enter that number here. This setting is ignored if you are formatting the paper with a style that does not create numbered references in the bibliography.