No, the indents for a particular outline level in Outline view
are determined by Word. What you can do is set "true" indents
via the Paragraph dialog box.
Alternatively, if you are creating a numbered outline, use the
Customize Outline Numbered List dialog box (Word 97-2003) or
the Define New Multilevel List dialog box (Word 2007). For the
general principles, see
http://www.shaunakelly.com/word/numbering/OutlineNumbering.html.
If you are using Word 2007 and need further assistance, post
back.