How to Add New Product Key (Never-used) to Norton Account?

I have a Boxed CD of Symantec Norton NIS 2011 that I purchased and have never used!! How do I add it (and the time) to my Norton Account and still keep NIS 2012 19.9.0.9, Nathan wants to upgrade me first . I still have 40 days left but want to add it Now, Thanks,,,, Gorpy1