Answer:
If you have used Heading styles in your document, creating an automatic table of contents is easy.
Explanation:
https://guides.lib.umich.edu/c.php?g=283073&p=1886010
An automatic Table of Contents uses Styles to keep track of page numbers and section titles for you automatically. Microsoft Word can scan your document and find everything in the Heading 1 style and put that on the first level of your table of contents, put any Heading 2’s on the second level of your table of contents, and so on.
If you want an automatic table of contents you need apply the Heading 1 style to all of your chapter titles and front matter headings (e.g. “Dedication” and “Acknowledgements”). All major headings within your chapters should be use the Heading 2 style. All subheadings should use Heading 3, and so on.
If you have used Heading styles in your document, creating an automatic table of contents is easy.
Place your cursor where you want your table of contents to be.
On the References Ribbon, in the Table of Contents Group, click on the arrow next to the Table of Contents icon, and select Custom Table of Contents.
If you want to change the style of your table of contents (e.g. you want more space between the items on level 1 and level 2 of your table of contents, or you want all your level 1 items to be bold), click on the Modify button, select the TOC level you want to change, then click the Modify button to do so.
If you want to change which headings appear in your table of contents, you can do so by changing the number in the Show levels:
pulldown.
Click OK to insert your table of contents.
The table of contents is a snapshot of the headings and page numbers in your document, and does not automatically update itself as you make changes. At any time, you can update it by right-clicking on it and selecting Update field. Notice that once the table of contents is in your document, it will turn gray if you click on it. This indicates that it is getting information from somewhere else.
