Server Administration :: Create Subpartition For Existing List Partition

We have a table which is already partitioned by list and now we would like to add a subpartition.

Create table Item_mst
(
ccn varchar2(10),
Flag varchar2(1),
Item varchar2(10),
status varchar2(1)
)

[Code]..

Now I could like to alter the above table for adding a new subpartition on each partition on status.

ALTER TABLE Item_mst
MODIFY PARTITION Item_mst_Test
ADD SUBPARTITION Item_mst_Test_A VALUES ('A');

Above alter gives ORA-14253: table is not partitioned by composite range method.

However dropping and recreating the table with subpartitions is working fine.

But Dropping and recreating the table in production is very cumbersome as it has huge data and many indices.