Returns or sets the heading level style that's applied to the chapter titles in the document. Can be a number from 0 (zero) through 8, corresponding to heading levels 1 through 9. Read/write Long.
Remarks
Before you can create page numbers that include chapter numbers, the document headings must have a numbered outline format applied that uses styles from the Bullets and Numbering dialog box. To do this in Visual Basic, use the ApplyListTemplate method.