paying for multiple copies ofthe software

We purchased 7 copies of Avast on the same registraion number, and one more on a separate number. Now we want to add 4 more copies. Is there any way to get all the copies on the same number and syncronized so we can update our account for all copies at the same time?

You would probably be best contacting sales (at) avast dot com directly, I’m sure they will help if they can.