a) her 6 month visitor permit will expire in next 3 months. we need to extend her visitor permit so that she can continue to live here. is it possible to renew visitor permit after our marriage is registered, but while we have not sent her PR application (planning to do an inland application). on the other post that i have read, other people have already either applied for PR before visitor extenion (and shown their PR application number when submitted extension for visitor permit), or they submit the PR application at the same time with the visitor extension.
the reason i cannot submit PR application before or at the same time as her visitor permit extention application is because we need some more time to prepare all the papers for the PR application after we get married.
Yes, you can apply to extend her visitor status based on that you have gotten married and are preparing your PR application and will apply.
b) if it is easier to apply outland, then we are planning that we go back to China after registering our marriage here in Canada.
i) is it ok to have the marriage registered in Canada while she was on visitor visa, and then apply the PR application in China
Yes, that is fine.
ii) if i have want to live with her in China while the PR application is in process is that ok. I read somewhere that to sponsor wife with an outland application, if the husband has PR and is not a citizen, then he has to remain in Canada while the application is in process
Yes, a PR sponsor must be residing in Canada
iii) if i have to technically remain in Canada while her out PR application is in process, i can ask my company to transfer me to China to continue to work there for 1 year (this would not be a problem). so if i am continuing to work for Canadian company that has transfered me to China because of the job, will this be ok
No, I PR sponsor must be residing in Canada, not technically but physically. Working for a Canadian employer in China may count towards your PR residency requirements but does not count as residing in Canada for a sponsor. You may be able to risk short trips to visit your wife during the processing time, I would say definitely not longer than 2-3 weeks and make sure somebody is checking your mail and messages in case immigration tries to get in touch. If immigration finds out that you have left Canada and believes you are not residing in Canada, they can cancel your application.