Canadian citizen sponsoring international student with work -permit after graduation

I have never submitted one of these applications myself, as I'm just the webmaster, but my understanding is that when there is nothing on the form that fits your situation, a letter of explanation is usually the best answer.
Just for the information. I got my PR in 6 months from the point I applied! I made sure my all docs are in order and clear to understand. The cover letter helped a lot!! IInland application works faster