Great question — answering as the UphillTech team:
Yes, it is possible and quite easy. You login, go to the Admin page, which should say Account Administration upon entering the page. Then, you just click on the + New Account button. OR You can add a different site to a current account by clicking on that account and then clicking on the +New Property button. Then, the rest of it is just like you've done before.
Full answer by tacotuesday: https://webmasters.stackexchange.com/a/33243 (CC BY-SA 4.0).
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