Hello vinve,
1) you can create categories, sub-categories and sub-sub-categories, ecc...
2) you can import a .csv file in to selected category.
File features: fields terminated by colon ( ; ), fields enclosed by double quotes ( " " ).
Fields list: title, subtitle, alias, id editor, price, pag, user id,  user alias, description, image name, file name, year, id location, id library, vote, numvote, hits, published, qty, isbn, approved, userid, url, url label, date insert, catalog, checked_out, checked_out_time, access, metakey, metadesc, note, editedby, catid, authors. The authors field is an authors list separated by semicolon.
Import does not include the images and linked files, but you can copy the images to same folders that you have set on Abook configuration.