I am trying to copy few rows of the data from that table into a new table (which has a new name but the same schema) from the same database.

How can we achieve this ?

SQL like:
insert into NEWTABLE (field1, ...) values (SELECT field1,... from OTHERTABLE where filter)

Hibernate Like:
query1 = session.createQuery("from OtherTable ");

rs = quey1.list();
//iterate on each object
NewTable obj = new NewTable ();
obj.setField1(nextgetField1())

session.save(obj);

caution: for batch processiong take a look at http://docs.jboss.org/hibernate/stable/ ... batch.html