I've never owned a Yamaha, so I don't know how they work, but on technics and KORG, when I found styles that I might use together, but were in different style 'sections' I would COPY the style, put it in a USER section and rename, tweak, whatever, and then do the same with the second style, placing it close to the first one ... I've done this with LATIN and SWING styles quite a bit ...