You mean from the Internet Search window? Check ON the box that says to import to hits. Then hold the Shift key down when importing -- the imported references will be added to the existing hits.
Jon wrote:You mean from the Internet Search window?
No. Rather from a text file by drag and drop. I usually download the ref from the publisher's site at the time when I download the pdf. I do this article per article that I don't mix up pdf and ref. At the end I like to see my new acquisitions