There are several approaches here.
- If you want the word "Appendix" or "Appendices" to appear in the TOC, but without a page number, then you can use a different heading level for that title and omit the page number for that level. That is, apply an unused heading style to the Appendix title (you can make the style look identical to Heading 1) and then add the \n switch to the TOC field as described at http://wordfaqs.ssbarnhill.com/TOCTips.htm#OmitPageNumbers. If you want to use the word "Appendices" instead, but it doesn't appear in the document, you can use a TC field, as described at http://wordfaqs.ssbarnhill.com/TOCTips.htm#TCFields .
- If you want actual page numbers for the appendices, you could include a cover page for each appendix (using the Heading 1 style). Each would be a separate section with page numbering restarted at the appropriate number to account for the pages in the previous appendix.