Auto Numbering
Opening the Customization Window
Select Custom Numbering from the numbering dropdown.

Custom Numbering
Customize
Customizing Level 1 Numbering Format
Select level 1, change the numbering format to ①、, select 一,二,三,… for the numbering style, link the level to the style Heading 1, set after numbering to Space, and modify the rest as needed.

Level 1 Numbering
Customizing Level 2 Numbering Style
Similarly, note that the numbering format should be changed to ①.②, the numbering style should be set to 1,2,3,…, and check Legal style numbering.

Level 2 Numbering
Customizing Level 3 Numbering Style
Same as level 2 numbering, but note that the numbering format should be changed to ①.②.③.

Level 3 Numbering
Application
Generally, you only need to set up three levels of numbering. After clicking OK, select the text and switch to Heading 1 in the Home menu to set the text as a level 1 heading. The same applies to other levels.

Application
Table of Contents
Select an appropriate table of contents under the References menu.

Table of Contents