How can i create trriger when inserting record in foreign key

i have two table
ward(id,erf_no,zone)
property(id,war_id,Address_Line)
ward.id = property.war_id
i what to create new ward id whenever am inserting new record in property
something like this but i don't what to insert in property id i what to insert in ward table new id
CREATE OR REPLACE TRIGGER ASSIGN_propid
BEFORE INSERT ON SMS_PROPERTIES FOR EACH ROW
BEGIN
IF :NEW.ID IS NULL OR :NEW.ID < 0 THEN
SELECT SMS_MAST1_SEQ.NEXTVAL
INTO :NEW.ID
FROM DUAL;
END IF;
END;
{code]

Here's an example:
http://www.oracle-base.com/articles/misc/populating-master-detail-fks-using-sequences.php

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How can i create trriger when inserting record in foreign key

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