Summary: Use the Azure Resource Manager cmdlets to alter the current active subscription in use.
I have about a dozen different subscriptions in my Azure Resource Manager account. How can I change it from the default one to one of my others?
You can do this very task by using the Select-AzureRMSubscription cmdlet and providing either the name of the subscription or the SubscriptionId (which is probably more accurate). Here are examples:
Select-AzureRMSubscription –SubscriptionName ‘My MSDN Subscription’
Select-AzureRMSubscription –SubscriptionID ‘11111111-1111-1111-1111-111111111111’