Better to get the transcript of Diploma as well. If the board doesn't want to issue you the transcript in desired format then get the photocopy of marksheets of all the semesters and the photocopy of diploma certificate (Final or Provisional) and request the Registrar or Controller of...
Exactly the same situation with me. I got my latest result and missed CLB 9 because of 0.5 less score in writing. If I had scored CLB9, I would have got ITA by now. Now, will go for revaluation and meanwhile prepare rigorously for IELTS.
There is no extra charge for the number of degrees. You can send as many qualifications as you want under one reference number. I sent my Diploma+B.Tech+M.Tech all together and paid only one.
Thanks