A table of contents is a tool that helps users navigate a document. Most table of contents are organized under headings that identify topics in the document. By default, Word has four levels of headings in its gallery, but more can be added as needed.
Word will automatically create a table of contents page if a document is designed using Heading and Paragraph styles (see the Styles section). Once you have created a document using the styles feature, follow these steps to insert a table of contents:
To edit your table of contents, you don't need to physically change anything in the table of contents itself. Simply, make the changes in the actual document and then click the Update Table button on the References tab.
To edit the display style of your table of contents: