In Word 97-2003, you can type in Heading 4 in the Styles box on the
Formatting toolbar.
In Word 2007, you can type in Heading 4 in the Apply Styles pane (which can
be displayed by pressing Ctrl+Shift+S).
If you are trying to set up a numbered outline, see
http://www.shaunakelly.com/word/numbering/OutlineNumbering.html.
The same article might be helpful even if you are using Word 2007, but many
steps on the way are different. For example, you can no longer create
outline/multilevel numbering via the Modify Style dialog box. Instead, you
have to place the insertion point in a level 1 paragraph (which means Heading
1 in the case of heading numbering); then click Home tab | Multilevel List |
Define New Multilevel List.