During check-out, you can purchase multiple subscriptions.
A single website management subscription covers a single website, domain, subdomain, or WordPress installation.
Sites like yourwebsite1.com and smile.yourwebsite1.com require separate subscriptions.
yourwebsite1.com, amazonwebsite1.com, and googlewebsite1.com are 3 separate websites and would require different subscriptions.
During check-out, update the number of subscriptions in your cart to start managing multiple websites.
Depending on the needs of each site, you are welcome to choose different plans.