Checkout the "Sign up for Windows Azure as an organization" page on windowsazure.com: http://www.windowsazure.com/en-us/documentation/articles/sign-up-organization/
Quoting from the site:
"Once this tenant has been created, an admin can then issue organizational accounts to each of its employees/students and assign licenses to those accounts based on which cloud service subscriptions they need access to, such as Windows Azure."
Sounds like what you need!