If you just wanted to remove the leading spaces then just use the trim function:
SQL> INSERT INTO DEPARTMENT VALUES (' IT DEPARTMENT - ');
1 row created.
SQL> INSERT INTO DEPARTMENT VALUES (' FINANCE DEPARTMENT OR IT');
1 row created.
SQL> INSERT INTO DEPARTMENT VALUES (' MANUFACTURING DEPT ');
1 row created.
SQL> COMMIT;
Commit complete.
SQL> SELECT TRIM(COL1) FROM DEPARTMENT;
TRIM(COL1)
------------------------------------------------------------
IT DEPARTMENT -
FINANCE DEPARTMENT OR IT
MANUFACTURING DEPT
Badrinath
There is always a better way to do the things.