Two keys on one Norton account

I'm not sure if Subscriptions was the right section for this question, since instead of subscriptions I still use product keys.

But my question:  I have two keys which I will soon be activating.  Can I use the same single Norton Account to activate the two different keys (for different devices, of course), without the second key that I add canceling the first?  If not, what is the simplest alternate approach?  Thanks.

Thanks for providing that info.  Exactly what I needed.

Yes, normally I would buy one key to cover all devices, as you suggest.  But -- without going into details -- I ended up with a 1-device key, and have 4 devices in total.  So I obtained a 3-device key to use in addition, hence my question re whether I could add both keys to the same Norton Account.

 A product key activates a subscription.

You can activate as many product keys as you need with the one Norton Account. Activating another key will not affect any existing subscription.  

Generally it is less expensive to purchase a single subscription that covers multiple devices rather than separate subscriptions for single devices. And then you only have one subscription to manage.