Hello Hooks! Yes, you can add multiple domains to your pOS instance, but please note that additional fees may apply. Check the billing plan attached to your instance for more information.

You can add multiple domains to your instance but do you want different content on each domain? If yes you'll have to do some coding to detect the URLs and then they will be using the same base content. Otherwise in your partner portal you can have different instances with different domains (but I don't think this is what you are asking)