The Customer dashboard contains a subscription summary box that provides a quick visual cue of how many subscriptions exist under a customer and how many of those subscriptions are currently in Active status.
From the subscription summary box you can:
Access Subscription Settings to control how all subscriptions will behave under the specific customer. See Subscription Settings
Add new Subscriptions directly from the customer dashboard. See Adding Subscriptions to a Customer
Access the Customer Subscription Dashboard to manage existing subscriptions. See Subscription Dashboard