Will my NIS subscription 'add on' or will I lose what I now have?

I have NIS 2009 installed with about 2 months remaining on the subscription. I was looking at purchasing a 24 month subscription which would have a different product key number than what I have now for this subscription.

 

 

Will the 2 months remaining show as 26 months remaining if I click on the 'subscribe now'  button and at 'enter a subscription renewal code or another product key' I enter the new product key number?

 

Thanks for any information about my inquiry.