You might also consider using a mixture of tags and custom fields. For example, I wanted to create a sub-set of Jewish-themed books. Rather than going through and creating umpteen sub-genres (Jewish.Fiction, Jewish.Biography, Jewish.Fiction etc) I just used a tag instead of the custom genre field. Now, I can do a search for the tag 'Jewish' and then use the 'restrict to...' dialog box to limit my list view to just that set. When I go to the side-bar, I can see all my genres (fiction, non-fiction etc.) and see which books they contain.
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