If Microsoft Azure has become part of your life as a developer you may have more than one subscription associated with your account. For now, in order to separate the resources for different environments you use a different subscription (This is fixed with Azure Resource Groups on the new portal). As you know, you can filter subscription through the portal.
When you work with Visual Studio is also possible to see the cloud services through the Server Explorer window. If you have access to multiple subscriptions will appear all services by its corresponding category. But it is also possible to filter by subscription from Visual Studio. Just click the right mouse button on the first node called Azure and select the Manage Subscriptions option …
A dialog box appears where you can deselect those subscriptions where you have access but you don’t want that resources are shown in the Server Explorer window.
It is also possible to filter by region: