CoSchedule charges per calendar, so to have two calendars in your CoSchedule account you would need two separate subscriptions which are maintained and managed individually.
You can access both calendars from the same CoSchedule user account, but each calendar's subscription will be billed separately and can be accessed via the calendar's Settings > Billing page.
All of your calendars are also eligible for our referral and review program. If you write unique reviews and publish them on different websites for each of your calendars you can get 50% off of each subscription you write a review for. Also, each calendar comes with its own unique referral link to start accumulating referral credits to get 10% off every time someone you refer subscribes. You continue to receive that discount as long as their subscription is active. You can see more information on referrals and reviews on the CoSchedule Referral Program page.