Open the Word document and enter text.
Apply heading styles to headings at all levels. "Chapter 1" or "1" corresponds to the "first-level title", "Section 1" or "1.1" corresponds to the "second-level title", "I," or "1.1.1" corresponds to the "third-level title", " (1)" or "1.1.1.1" corresponds to "fourth-level headings" and so on.
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Open the "Navigation Pane" and you can see the items that exist in the document title.
If there is no "third-level title" or "fourth-level title" style in the default style box, you need to perform the operation in the figure below to call up the title style.
Key steps: Set automatic numbering for title styles. Click on a heading style, click "Multi-level list" in "Paragraph", and click "Define new multi-level list".
Click "More" in the pop-up settings window to open all options.
Click "1" in the upper left corner to set a first-level title, click "Link level to style" and select "Title 1". In the "Input number format", enter the text according to the text content of the first-level title (note: do not change the gray numbers). Select "One Two Three" in "Numbering style for this level".
Similarly, set up multi-level lists for other levels of titles.
After this setting, when a new title needs to be inserted or changed, the subsequent titles will automatically be numbered to maintain consistency.
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