Keith,do you have the trumpet and the sax in one staff? I guess that,
'cause otherwise the procedure would be the same as for the
trombone, which you obviously can handle well.
Seems to be that you entered trp and sax into to layers in one
staff, am I right? If so, select create a new staff, select
"show active layer only", select layer #2, copy this layer from
one staff to another and delete it in its original staff
(using backspace key). Now you created a new staff for the
layer #2 (sax) which you can extract the same way as the trombone.
Greetings,
Harald