Do I need extend again my visitor visa if before expires I'm applying like sponsorship

[Jenmlu]

I get my extension visitor visa, which is valid until 31st december 2017. but in November 15th I,m applying for my sponsorship and I would like to know if 30 before expires my extension I must apply again for an extension or it's not necessary because my application will be in process?

 

[Bs65]

http://www.canadavisa.com/canada-immigration-discussion-board/threads/do-i-need-extend-again-my-visitor-visa-if-before-expires-im-applying-like-sponsorship.518373/