After authenticating a user, the Sync Server determines what group the user belongs to, then queries the adminstration control database to determine what subscriptions belong to the subscription set referenced in the request.
These steps are part of the larger task of creating a subscription set. When you complete the steps for assigning a subscription, return to creating a subscription set.
To associate subscriptions with the subscription set:
If no subscriptions appear in the Available subscriptions list, click Create, then click either Create DataPropagator Subscription to create a DataPropagator subscription or Create File Subscription to create a file subscription.