View. Outline(Object) Expand
Expands the text under the selection or the specified range by one heading level.
public void ExpandOutline (ref object Range);
Public Sub ExpandOutline (Optional ByRef Range As Object)
Optional Range object. The range of paragraphs to be expanded. If this argument is omitted, the entire selection is expanded.
Note If the document isn't in outline or master document view, an error occurs.