by using INHERITENCE IT IS POSSIBLE
declare class c1
Declare method m1 importing obj type ref to class_name.
implement c1
create class c2 inherting for c1
method m1 redefiniton.
implement c2.
create object form class c2
call method m1 using object of class c2 and pass your reference as exporting parameter.
thanks & Regards
rajeshkumar