Update: Of course, it would help if I actually remembered that sub PACKAGE::name {} is legal syntax. *sighs* It's Monday.
What about plugging in your new logic into the original namespace?
package Employee::MyStuff;
package Employee;
sub ManagersCostCenter {
my $self = shift;
$self->Manager->CostCenter;
}
1;
__END__
Put that into Employee/MyStuff.pm and you're good to go.
Of course, you're now fiddling with the internals of a class you don't control, which means that you're violating encapsulation. You also, everywhere you use Employee, have to now do:
use Employee;
use Employee::MyStuff;
In that order would be preferable (though not absolutely required).
This is a somewhat common thing to do on CPAN. (q.v. URI and URI::QueryParam for a good example of this)
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