Hi savo,

You can't have a TOC not pick up content in a bookmark. If you're inserting pages that are not to appear in the main TOC, You will need either:
• two bookmarks (one for each side of the inserted range) - and two TOCs (one for each bookmarked range). If your inserted content is to have its own TOC, that too will need its own bookmark. Obviously, this gets more complicated as you add more portions requiring their separate TOCs; or
• use one set of heading Styles for the existing content and a different set of Styles (heading or otherwise) for the new content.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]