CREATE OR REPLACE PROCEDURE <Procedure_Name>
is
    TYPE RTG_REC IS RECORD (
    ROUTING_ID T_ROUTING_OPERATION.RTG_ROUTING_ID%TYPE,
    OPERATION_ID T_OPERATION_MASTER.OPN_OPERATION_ID%TYPE,
    SETUP_TYPE T_ROUTING_OPERATION.RTG_SEQ_DEP_SETUP_TYPE%TYPE,
    STEP_NUMBER T_ROUTING_OPERATION.RTG_STEP_NUMBER%TYPE,
    YIELD T_ROUTING_OPERATION.RTG_BASE_YIELD%TYPE
    );
    
    TYPE RTG_TAB IS TABLE OF RTG_REC; 
    T_RTG_OPN RTG_TAB;
BEGIN
...

SELECT ROUTING_ID, OPERATION_ID 
    FROM TABLE(T_RTG_OPN)
    ORDER BY ROUTING_ID;
...
END;

SQL> create or replace type typ is object (
  2    routing_id integer,
  3    operation_id integer
  4  );
  5  /

Type created.

SQL>  create or replace type tab is table of typ;
  2  /

Type created.

SQL> declare t tab := tab();
  2  begin
  3    for rec in (select routing_id, operation_id from table(t) order by routing_id) loop
  4      null;
  5    end loop;
  6  end;
  7  /

PL/SQL procedure successfully completed.