Your Lawyer advised you not to link because your Lawyer will link to THEIR account. Hiring a lawyer is same as appointing a representative so they need to know if CIC is requesting or advising anything.Hi Jawedi!
To be honest I am not sure. We are using a lawyer as well and were advised not to link either one. However if that's what your lawyer said, I would suggest try just using your UCI number from your AOR to link (as that's what I've seen other people do) and then fill in the rest of the information. The category I remember reading to select was "Work Permit"...but its probably best to wait for someone else to reply as I read that a few weeks back.
If you try and link your account too will screw it all up.