SQL & PL/SQL

Hi,
I am new in plsql programming and I would like to make a procedure.I have tables like the following TABLE1

|COL1 | COL2 | COL3 | COL4 | COL5 | COL6 |COL7|
| 600 | 140 | 2 | 10 | 1300 | 500 | 1 |
| 600 | 140 | 2 | 20 | 1400 | 340 | 4 |
| 600 | 140 | 2 | 15 | 1400 | 230 | 3 |
| 600 | 140 | 2 | 35 | 1700 | 120 | 2 |
| 600 | 150 | 3 | 10 | 1300 | 166 | 6 |
| 600 | 150 | 3 | 15 | 1400 | 435 | 5 |

For the same COL1 and COL2/COL3 , check the select different values from COL4
For instance for COL1=600 , COL2=140/COL3=2 and COL2=150/COL3=3
Return 20 and 35 as not common values

Then insert in this table TABLE1 the rows
600 , 150 , 3, 20 , 1400 , 340, 7
600 , 150 , 3, 35 , 1700 , 120, 8

I am trying to make the procedure like below but I have problem how to retrieve data in insert statement

PROCEDURE COPY_COLUMNS  ( P_COL1        IN  A.COL1%TYPE,
                          P_FROM_COL2   IN  B.COL2%TYPE,
                          P_FROM_COL3   IN  B.COL3%TYPE,
                          P_TO_COL2     IN  B.COL2%TYPE,
                          P_TO_COL3     IN  B.COL3%TYPE,
                          P_FLG1        IN  VARCHAR2,
                          P_FLG2        IN  VARCHAR2,
                          P_FLG3        IN  VARCHAR2                                      
                                     ) IS

CURSOR CFL1 IS select COL4
    FROM TABLE1
    WHERE COL1 = P_COL1 AND COL2 = P_FROM_COL2 AND COL3 = P_FROM_COL3
    MINUS
    select COL4
    FROM TABLE1
    WHERE COL1 = P_COL1 AND COL2 = P_TO_COL2 AND COL3 = P_TO_COL3;


CURSOR CFL2 IS select COL4
    FROM TABLE2
    WHERE COL1 = P_COL1 AND COL2 = P_FROM_COL2 AND COL3 = P_FROM_COL3
    MINUS
    select COL4
    FROM TABLE2
    WHERE COL1 = P_COL1 AND COL2 = P_TO_COL2 AND COL3 = P_TO_COL3;


CURSOR CFL3 IS select COL4
    FROM TABLE3
    WHERE COL1 = P_COL1 AND COL2 = P_FROM_COL2 AND COL3 = P_FROM_COL3
    MINUS
    select COL4
    FROM TABLE3
    WHERE COL1 = P_COL1 AND COL2 = P_TO_COL2 AND COL3 = P_TO_COL3;  


V_REC        CFL1%ROWTYPE;


BEGIN


IF P_FLG1='N' OR P_FLG2='N' OR P_FLG3='N' THEN
    GOTO label; --do nothing
END IF;


IF P_FLG1 = 'Y' THEN

    OPEN CFL1;
    FETCH CFL1 INTO V_REC;
    CLOSE C1;

--    SELECT COL5, COL6
--    FROM TABLE1
--    WHERE COL1 = P_COL1 AND COL2 = P_FROM_COL2 AND COL3 = P_FROM_COL3 AND COL4 = V_REC.COL4;


    FOR REC IN CFL1 LOOP
        INSERT INTO TABLE1 
            SELECT P_COL1, P_TO_COL2, P_TO_COL3, CFL1.COL4, -- COL5 ?? , COL6 ?? -- , SEQname2.NEXTVAL) 


    END LOOP;

END IF;

<<label>>
END;

Could you help me please do it ?
Thanks in advance