Science style

Hello, I am not very familiar with EndNote so maybe I am missing something easy. I am writing for Science and need to insert a reference to “Materials and methods can be found at…” in the numbered bibliography.

I have tried inserting a note, but I want to refer to the same note many times and only have it appear once in the bibliography (currently, it appears as many times as I reference it).

If using Insert Note is not possible, what is the simplest alternative option?

thanks 

Since inserting note(s) creates a corresponding bibliography entry (or entries), If you want the reference to be listed once in the bibliography, could you insert a note for the first reference. Then elsewhere in the document when you need to reference the same note, just manually type what’s needed?