Add user or group / Ticket Custom Role

hi
how to add user or group to “Ticket Custom Role” with Scrip?
like this for add a user to Ticket cc:

my $user = RT::User->new($RT::SystemUser);
$user->LoadByEmail(‘user@domain.com’);
my $cclist = $self->TicketObj->Cc;
$cclist->AddMember($user->Id);

tanx

I found it:
my $RoleGroup = RT::Group->new($RT::SystemUser);
$RoleGroup->Load(‘913145’);
my ($success, $msg) = $ticket->AddWatcher(Type => ‘RT::CustomRole-1’, PrincipalId => $RoleGroup->PrincipalId);