Computer: ASUS A456U.

System: win7.

1. Open the word document on the desktop and enter the directory you want to change.

2. Select the text that needs to be set as the first-level title, and click "Title 1" under the "Start" option in the ribbon.

3. Hold down the ctrl key to select all the words that need to be set as subtitles.

4. Click on "Title II" above.

5. Hold down the ctrl key to select all the text that needs to be set as the third-level title.

6. Similarly, click "Title III" above. Now that all the formats have been set, let's start generating the catalog.

7. Click "Enter" at the beginning of the first-level title to leave a spare line above it, put the cursor in front of the spare line, and then click "Reference" on the ribbon.

8. Find the first table of contents under Reference, and click to find the automatic table of contents below.