Bruji

Start creating a Smart List. In the Field Name popup, there's one called Book. I don't see it in the list of fields in the Fields Preferences pane.

It's a special type of smart collection rule to base a smart collection on another collection. Selecting it will make the next popup have "is in collection" and "is not in collection" and the text field would take the exact name of the collection. Done this way so that the rule is easily understandable, as it would read "Book is in collection Favorites".