If you delete a subscription from the Subscriptions folder of the source it is associated with, the subscription also is removed from any group to which it is a member. If you just want to remove a subscription from a group, keeping it associated with the original source and available to include in other groups, select the subscription from the appropriate Members folder and select the Delete Member command.
If you select a group and choose the Delete command, a dialog appears so you can choose whether you only want to delete the group and its members, or you also want to delete all the member subscriptions from their original Sources\Subscriptions folders too. Choosing the Delete All Group Member Subscriptions option does not delete subscriptions that are also members of another group.
You cannot delete a subscription or a group that is currently running.