@ramatsu, I’m skeptical that choosing Helvetica Neue in Webflow would hook up to the fonts.com version, because the font-family would have to be something like "HelveticaNeueW02-UltLt" for that to hook up correctly. Though I could be wrong, and the browser might be a doing some sort of fuzzy matching.
Right now, I’m experimenting with a way for you to manually type in a font-family value so that you can set it even before we add Fonts.com integration (no ETA on that yet, unfortunately).