TOC Heading Level 1
To set a headling level 1, select the text that you'd like to see in the table of contents as a heading 1. Then select the Home tab in the toolbar at the top of the screen.
Then click on the Heading 1 button in the Styles group.
Now when you update the table of contents, you should see Microsoft as a Heading 1.
TOC Heading Level 2
To set a headling level 2, select the text that you'd like to see in the table of contents as a heading 2. Then select the Home tab in the toolbar at the top of the screen.
Then click on the Heading 2 button in the Styles group.
Now when you update the table of contents, you should see Word as a Heading 2.