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No way to do it with the Reader's own TOC, but if you're using software which lets you generate "links" within a document, you could always create your own hierarchical TOC using hyperlinks. I've done something similar with the various "anthologies" I've posted to the "Book Uploads" forum section - I start each one with an index of books, and then each entry in that takes you to a separate "Contents" page for that book.
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