Enter the desired split parts into those extra staves. Triple-click the first extra staff, then shift-click on the second extra staff so that they're selected throughout the entire piece. Click the “Hide Empty Staves” command so the extra staves won't appear throughout the score once the split parts aren't being used.
How do I change staves in Sibelius?
To do this:
- Select the portion of the staff you want to change to a different instrument (or triple-click the staff to select the staff for the entire piece)
- Go to Home > Instruments > Change.
- Select your new instrument from the Instrument Change dialog, and click OK.
How do you hide unused staves in Sibelius?
How to Hide Staves in Sibelius
- To hide Staves in Sibelius 7, select the staves that you want to effect.
- Choose Layout > Hiding Staves > Hide Empty Staves.