annotated bibliography isn't as of yet possible (the notes cannot be called with csl. You can create an annotated bibliography using whatever is in the extra field and/or the abstract field - see Chicago style annotated bibliography on the repository).
Two ways to create just bibliography:
1. Select the items in Zotero (within Firefox), right-click, select create bibliography, to clipboard, copy&paste.
2. Insert one citation, then insert bibliography, then delete the citation and before refreshing the document, edit the bibliography, adding all the citations you want.

that style uses what's in the "extra" field.
To change that to "Abstract"
change
<text variable="note" display="block"/>
to
<text variable="abstract" display="block"/>

http://www.zotero.org/support/csl_simple_edits

My challenge is the opposite of tsnyder1 and emcleary. I use MSWord and I write in the area of history. I deal with a lot of items from archives (e.g., letters, reports, chronicles). There can be hundreds of them in a chapter which need to be cited in the footnotes/endnotes, but they are not usually individually listed in the bibliography. Maybe I missed something when I was testing this before I started using it for my latest work, but I thought I could generate a bibliography; then using "Edit Bibliography" remove items from the bibliography by highlighting an entry in the "references in Bibliography" list and pressing the green arrow pointing to the left. Unfortunately, that also removes the citation in the footnote/endnote. I tried using the editor to manually delete the entry, but it still leaves an empty line.

Any suggestions?

Thanks for the suggestion. It still shows up in the bibliography. The original information from the database is preserved and presented in the bibliography, which is probably a good thing. I'll not be needing the final bibliography for a few months. In the meantime, how do I request a change?

Although I'm not a Zotero specialist, I can tell about my own experience.

For me, the problem was to distinguish several parts in the bibliography, although citations would concern all of them.

I think the way I did it can be copied for other purposes.

I entered all the items in one collection. I added tags to the items, so as to use them to select items in the advanced search, saving the results. By this way, I obtained different views in Zotero (some items appear in several views).

The result is that I have a collection with several advanced searched lists, from which I can select items for citations, while writing the thesis.

At the end, I will insert the bibliography section, by creating as many "bibliographies" as my several advanced searched lists.

In case "There can be hundreds of them in a chapter which need to be cited in the footnotes/endnotes, but they are not usually individually listed in the bibliography.", I would use a particular tag, create a dedicated advanced searched list, without creating the corresponding bibliography.