There is already a Portal application: http://appdb.winehq.org/objectManager.php?sClass=application&iId=5936 Please move Portal 2 http://appdb.winehq.org/objectManager.php?sClass=application&iId=12988 version there.
many many many games that have sequels and such in the AppDB are all under their own entries... Its not like its just an updated version or a patch, its a sequel... I don't see why it would be grouped together. if was looking for Portal 2, I'd look for an entry for it before I looked under Portal 1.