The sample doc you provided doesn't have any styles in use other than TOC styles. Please supply a beefier sample doc where you have styles which play the role of headings and actually make it clear as to whether the headings have autonumbering or not.

If your headings have autonumbering on them, those will also appear in the TOC unless you do something clever with style separators.

You can apply an outline number list to TOC styles but you need to firstly stop those styles from automatically updating before going and fiddling with the outline lists for the TOC styles.

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Andrew Lockton
Chrysalis Design, Melbourne Australia