I\'m trying to understand the appxmanifest file for APPX packages better. I noticed it has an
tag followed by a single
.appxbundle package is the likely solution to your question.
http://msdn.microsoft.com/en-us/library/windows/apps/bg182885.aspx#two
The manifest does define this as a possibility, and with hand editing, it is possible to do this.
However, you won't pass store certification for this I believe.