<I’m not sure if the current typo supports multi user blogs using
<subdomains or not.
As you can seen on the WishList ist on the RoadMap for a future -
release 4.0+ - :
As it is not implement at this moment you are alsoe able to write a
UserStory (http://www.typosphere.org/trac/report/13) if the current
issue (http://www.typosphere.org/trac/ticket/343) is not exact enough.