You can apply numbering to a paragraph manually or with a paragraph style.
If you want numbered headings, use Heading Numbering, instead of numbering manually.
To apply numbering manually, click in the paragraph, and then click theicon on the bar, or use the dropdown box on the icon to select a numbering format.
You cannot apply manual numbering to paragraphs that are listed under "Special Styles" in the Styles window.
When you press Enter in a numbered or bulleted list, LibreOffice automatically numbers the next paragraph. To remove the numbering or bullet from the new paragraph, press Enter again.
To change the bullets or numbering format for the current paragraph only, select a character or word in the paragraph, choose Bullets and Numbering, and then click a new format.
To change the bullet or numbering format for all paragraphs in the list, ensure that the cursor is in the list, choose Bullets and Numbering, and then click a new format.
Use the commands on the Bullets and Numbering bar to change the order and level of list paragraphs.
Paragraph Styles give you greater control over numbering that you apply in a document. When you change the list style assigned to a paragraph style, then the numbering format in the list style is applied automatically to all paragraphs using the paragraph style.
Choose, and then click the icon.
Right-click the paragraph style that you want to apply numbering to, and then choose Modify.
In thebox, select the list style to apply.
Apply the paragraph style to the paragraphs that you want to add numbering to.