If your document requires TOCs for chapters or chunks of text that are all together, you can use a TOC that collects entries only from bookmarked text.
Bookmarks in Word are not used just for TOCs; they identify a location or selection of text that you name for future reference.
First you need to bookmark the text of the entire chapter (or chunk). Then you create a TOC and use the \b switch along with the bookmark name. From the bookmarked chapter, the TOC field then collects text marked with heading styles or outline levels, depending on what other switches you use.
You'll get to try this in the practice session.