SQL & PL/SQL

Dear Gurus,

I have an issue where I need to create a cursor, and use the fields from that cursor, to create another cursor, and perform actions in the second cursor.

Below is my main cursor:
===========================================================================
DECLARE
v_DMDGROUP dfu.DMDGROUP%TYPE;
v_beforevalue udt_master_updates.udc_before_value%TYPE;

CURSOR curtrackdfuchanges
IS

SELECT *
FROM udt_master_updates
WHERE udc_data_element IN
('RESTERRITORY', 'RESREGION', 'RESAREA', 'COMMTERRITORY',
'COMMREGION', 'COMMAREA', 'COMPTERRITORY', 'COMPREGION',
'COMPAREA')
AND udc_action = 'CHANGED'
AND udc_interface = 'DMDGROUP';


recdfu curtrackdfuchanges%ROWTYPE;
v_sql VARCHAR2 (300);
BEGIN
OPEN curtrackdfuchanges;

LOOP
FETCH curtrackdfuchanges
INTO recdfu;
===========================================================================

Now based on this cursor's output, I need to create a new cursor which will extract three fields of a table (DFU) which are primary keys. But this action needs to be performed inside a FOR loop, as it needs to be done for many other rows for which this condition is true.

Is it posible to create a cursor inside a FOR Loop ? If yes, does anyone have a syntax for a code which has a top level cursor, and a cursor inside a for loop with the outputs of the first cursor?

Thanks in advance for your reply.

With Regards,
Swapneel Kale