You can copy staff styles that you use frequently to other projects. You can import all staff styles from another project, or copy only selected staff styles.
Do one of the following:
Choose File > Project Settings > Import Project Settings.
Click the Browsers button 
in the control bar, then click All Files.
Navigate to and select the project file, then click the Import button.
Note: If accessing the settings from the All Files Browser, you also need to click the Import Settings button, which appears after you click the Import button.
In the Import Settings dialog, select the Staff Styles checkbox (and deselect all other settings that you don’t want to import), then click the Import button.
All staff styles from the other project are imported into the current one.
In the project that contains the staff styles you want to copy, open the Staff Style window. (Single view is displayed.)
Double-click in the space below the Staff Style parameters to display a listing of all staff styles.
Select the staff styles you want to copy, then choose Edi > Copy (or press Command-C).
Open the Staff Style window in the target project, then choose Edit > Paste (or press Command-V).
Note: If you copy a MIDI region from one project to another, and the staff style used by the original MIDI region doesn’t exist in the target project file, it is automatically copied, along with the MIDI region.