Brother MFC-8460N - Manual (Page 175)

10. ControlCenter2 (For Mac OS ® 10.2.4. or greater)
169
COPY / PC-FAX
10
The Copy1-Copy4 buttons can be customized to allow you to use advanced copy and fax functions such as
N-in-1 printing.
To use the Copy buttons, configure the printer driver by clicking the button while holding down the Ctrl key.