No, that is not possible.

A possible workaround is to have your 'main' Table of Contents in a separate document, with its own TOC Styles, and link that Table of Contents to your current document's headings via an RD field, for which see: https://support.office.com/en-us/art...1-499e778dd806

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]