Applies the next heading level style (Heading 1 through Heading 8) to the specified paragraph or paragraphs. For example, if a paragraph is formatted with the Heading 2 style, this method demotes the paragraph by changing the style to Heading 3.
expression.OutlineDemote
expression Required. An expression that returns a Paragraph or Paragraphs object.
Example
This example demotes the selected paragraphs.
Selection.Paragraphs.OutlineDemote
This example demotes the third paragraph in the active document.
ActiveDocument.Paragraphs(3).OutlineDemote