[DiapDealer]

Originally Posted by exaltedwombat

Could I have done this more easily by direct editing toc.ncx? I can't see from examining it how the hirearchy is set.

You could have done it by directly editing the toc.ncx. "More easily" is extremely relative.

navPoints are nestable ... as per this example:

<navMap>
  <navPoint id="np_1" playOrder="1">
    <navLabel>
      <text>Blah</text>
    </navLabel>
    <content src="Text/part0001.xhtml"/>
    <navPoint id="np_2" playOrder="2">
      <navLabel>
        <text>1</text>
      </navLabel>
      <content src="Text/part0002.xhtml"/>
    </navPoint>
  </navPoint>
<navMap>

"Flattening" that same toc.ncx would necessitate un-nesting the navPoints (putting them on the same level):

<navMap>
  <navPoint id="np_1" playOrder="1">
    <navLabel>
       <text>Blah</text>
    </navLabel>
    <content src="Text/part0001.xhtml"/>
  </navPoint>
  <navPoint id="np_2" playOrder="2">
    <navLabel>
      <text>1</text>
    </navLabel>
    <content src="Text/part0002.xhtml"/>
  </navPoint>
<navMap>

Hope that helps!