Collections; Kindle 3; Calibre

Sorry if this has been asked before but I'm not very tech-savvy and after playing around with Calibre plug-ins for a while, I gave up.

If I have, for example, 30 Stephen King books, can these be inserted within a created folder done via Calibre? Or do I have to individually select each book manually on the device (Kindle 3) itself to insert into the folder?

Thanks.