The question sounds vague. Application procedure is listed on CIC website.
If you have a PR application in process and have passed the AOR stage at least (or nominated by province) and your prior work permit is about to expire (less than four months remaining), you should apply for BOWP, it is one of the choices in types of wp, but i believe using the same form, you attach your PR proof along and submit a regular wp application. I presume this would include sending your passport and it would be stamped with TRV (if you are from a country which needed trv to enter canada and it is expiring).
Why would you need to apply for trv separately?