If you have completed a thesis for master's degree by research, you may be permitted to submit it for examination for a Doctor of Philosophy.

Likewise, if you have completed a thesis for a Doctor of Philosophy, you may be permitted to submit your thesis for examination for the award of master's by thesis. 

Before examination, write a request to the Board of the Graduate Research School that your thesis be examined for a different level of research higher degree candidature. This request needs to be endorsed by your supervisors and graduate research co-ordinator, and submitted to the Graduate Research and Scholarships Office

Schools will be asked to nominate appropriate examiners. The examination process will proceed as if you were actually enrolled in the degree for which the thesis is being examined.