We (Company X) plan to develop an iPhone App for one of our Customers (Company Y). I would now like to use my developer enrollment for my Company X to develop, build and test the application.

When it comes to deployment I need to upload the App to the AppStore using Company Y as Company name/account. How can we do this?

Though this must be a very common scenario (X developing App for Y and selling/uploading under Y's name) I wasn't able to find a howto in the web or Apple FAQs.

Thanks in advance,
Hauzi