A subscription refers to the logical entity that provides entitlement to deploy and consume resources. Tenant users can view their subscriptions in the 'Subscriptions' page under 'My Account'.
Tenant admin can create subscriptions and can make any other user from the tenant company as a subscription owner.
On selecting a specific subscription, a list of users belong to the subscription is shown. Options to add new users and remove existing users are available.
Users to have one of the below roles for a subscription,
Has full access to all resources including the right to delegate access to others.
Can create and manage all types of resources but can't grant access to other
Can view existing resources