Thank you for your reply LeonidS. Ohhh okay, I got it now! That's a smart solution. Thanks. We are going to move our dev site from a subdomain to a subfolder on the same domain as subdomains are treated as separate domains when it comes to getting a license.
Now have you seen why official notes/replies from a UNA Representative (the UNA Team), especially regarding to licenses, payments, etc are so important? Things look clear now and you have helped us even more. Thanks ☺