Extend paid subscription?

I purchased a new 2 year license for AVG Ultimate but my current subscription is good for 6 more months. If I enter my new license number will it extend my existing subscription or will I lose the 6 months I have remaining on my old subscription?

Hello Rich,
We'd be glad to clarify this for you. You have an active subscription of AVG Ultimate valid till 2020.1.9 under your current account.
May I ask you from where you have purchased AVG Ultimate? If it is through re-seller, please register the code using the instructions in this article. Once it is registered under your current account, the validity will get added to your existing subscription. If this is the not the case, let us know from where you have purchased AVG Ultimate.