BAIB 2015 Newbie in need of more guidance.

In the attached song I wrote on both the treble and bass staffs. When I play the song back I hear both staffs. Sometimes I would like to only hear one of the staffs. Is it possible to play back only one of the staffs at a time? It sounds like the audio has been saved to just one track. The mixer panel show both staffs being played by only one instrument.I would like to switch between the two staffs. I hope I don't have to renotate another track with just the bass line on it? Simple guidance will be appreciated since I have never worked with a music composition program before.

Thanks

Larry

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