This sample shows how to use multiple binding files inside an Application to allow for one MSI to be used on multiple target environments. When you add multiple binding files as resources to your application, a drop list will appear when you import your MSI on your target environments.
This sample works with BizTalk 2006 and BizTalk 2006 R2.
Get more information from the original blog post on this topic: http://www.biztalkgurus.com/blogs/biztalk/archive/2006/09/12/How-to-Add-Multiple-Binding-Files-to-an-Application-in-BizTalk-2006.aspx