org: Headings and sections

 
 Headings and sections
 ---------------------
 
 The outline structure of the document as described in SeeDocument
 Structure, forms the basis for defining sections of the exported
 document.  However, since the outline structure is also used for (for
 example) lists of tasks, only the first three outline levels will be
 used as headings.  Deeper levels will become itemized lists.  You can
 change the location of this switch globally by setting the variable
 ‘org-export-headline-levels’, or on a per-file basis with a line
 
      #+OPTIONS: H:4