Hi,
Sure enough
You can use the Part/Display or Define a Part, and then either "Add" a new part and select just the staff/staves you want. When you're done, click "Display part and exit".
When you play the file, just the staves in that Part will display (you can change which Part displays by choosing it from the drop-list in the Menu bar) but you'll still hear all the staves in the file. I use this technique a lot when I'm working to learn a new bass line.
ttfn,
Sherry