Press the REC button to get ready to record a song.
Start the style playing (it's now being recorded).
Press the STOP button (in the song section, not the style start/stop) after the part that you're interested in has played.
Now you can press the SCORE button and press play to play what you recorded and view the notes on the screen.
You may have to change the midi channels to see the parts that you're interested in on the screen. You can do that by entering setup (8 button).

I hope that helps.