Setting tabs using the Tabs dialog box
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    You can add dotted, dashed, or underlined tab leaders. A tab leader links related but separate items across
            a page, such as entries and prices in a menu or chapters and page numbers in a table of contents.
  
  
            To set tabs using the Tabs dialog box, follow these steps:
1. Position the insertion point in a paragraph, or select the paragraphs that you want to adjust.
2. On the Layout tab, click the dialog box launcher:
            3. In the Paragraph dialog box, click Tabs... button:
            4. In the Tabs dialog box:
                - Using decimal numbers, type the position of the tab stop that you want to set in the Tab Stop Position box
 - In the Alignment group, select the tab style that you want: Left, Center, Right, Decimal, or Bar.
 - If you want a leader, select the tab leader style that you want in the Leader group:
                    
- 1 None for no leader (the default setting),
 - 2 for a dotted leader,
 - 3 for a dashed leader,
 - 4 for a solid underlined leader.
 
 - Click Set to set the tab stop. The Tab stop positions list box displays your tab stops after you set them.
 - Repeat these steps to set additional tab stops.
 
5. Click OK to close the Tabs dialog box.
See also this tip in French: Comment définir des tabulations à l'aide de la boîte de dialogue Tabulations.