Check the Restart Numbering After option, if you want sublevel numbers to start at 1. In most cases, you'll want to set the After option to the previous heading, as shown in Figure F. Doing so forces Word to start renumbering Heading 2 paragraphs after each new Heading 1 paragraph. In other words, when Heading 1 updates to 2, the sublevel number will start over at 1, generating 2.1, 2.2, 2.3, and so on.
Note  If TAB and SHIFT+TAB do not work for changing the indents for outline numbering, you probably have the option Tabs and Backspace set left Indent turned off. To change this setting, from the Tools menu, choose Options. Select the Edit tab and check the option Tabs and backspace set left indent. As an alternative to turning this option on, you can instead use ALT+SHIFT+LEFT ARROW or RIGHT ARROW to increase or decrease outline numbering. numbering using publisher