2. Set the format; Note that the titles at the same level here should be set in the same format; For convenience, create a new style for each level of title;

3. After setting the format, select "Define New Multilevel List";

4. In the pop-up dialog box, click the "More" option;

5. When setting the level, we should mainly pay attention to the following options: the level to be displayed in the library, the link level to the style (here we choose the first-level title), the numbering style of this level, and the format of the input number.

6. After setting up according to the previous steps, click OK, and you will find that the chapter titles of the paper have been automatically numbered according to the form we want!