Some books are not in Worldcat and need to be entered manually. Book section is not available either. Not sure if this was true before I downloaded the beta version.
@adamsmith Yes, that's what i am doing, but it's odd not to have book/book section as options I think given that journal articles are offered, and they are usually the ones added automatically.
@erazlogo -- note that you can create an item in any other item type and then switch it to book or book section as a workaround.