Click a group handle, then choose Staff > Edit Group
Attributes. You may also double-click a group
handle or choose Staff > Edit Group Attributes without selecting
a group. The Group Attributes dialog box appears. To display the attributes
of another group, click the arrow controls to select another Group ID
number.
Add staves to a group by choosing different
staff names from the Staff and Throughdrop-down
lists. All staves in between will also be
part of the group. For details, see Group
Attributes dialog box.