2. Select the first-level directory to be set, and click the title 1 in the upper right corner to generate the first-level directory.
3. Then, select the secondary directory to be set, and click the title 2 in the upper right corner to generate the secondary directory.
4. Then select the three-level directory to be set, and click the title 3 in the upper right corner to generate the three-level directory.
5. Then click the table of contents on the right and select the reference at the top.
6. Then in the open drop-down menu, click the directory format on the right according to your own preferences.
7. At this point, the word document directory has been successfully generated, and you can continue the next operation.