You can use the tag system and then choose to see only books from a single tag. Then you can upload all of these books onto your K3.
You can also create a new metadata column on Calibre and if you click it, it should order them in alphabetical order (according to the entered data in the column). I haven't tried this (I use the tag system), but I think it should work like this:
Twilight.............Fluff
Breaking Dawn...Fluff
Eclipse..............Fluff
1984.................SciFi
The Passage.......SciFi
2010.................Zombie
Zombie Attack....Zombie
Save the World!..Zombie
My Brains!..........Zombie
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