Most songs etc. are broken up into a set number of bars which get repeated at various times during the song.
If you can find a midi file of the song, load it into a sequencer and view it in notation mode, you should then be able to identify the repeats, thus allowing you to base your style on this. (Just play the notes you see on the screen into your style creator)

Most boards allow you to split a midi file into sections and select them using the normal arranger variation etc. so if it is something specific you want; this may be a better way to go. (It also has the advantage that you do not have to play the chords, thus leaving you left hand to use all the expression controls to make right hand voices sound as good as they can be.

Hope this helps

Bill