openbox/data/menu.xml

<openbox_menu>

<menu id="games-menu" label="Games">
  <item label="Crack-Attack">
    <action name="execute"><execute>crack-attack</execute></action>
  </item>
  <item label="XFRisk">
    <action name="execute"><execute>xfrisk</execute></action>
  </item>
  <item label="Quake III">
    <action name="execute"><execute>quake3</execute></action>
  </item>
</menu>

<menu id="apps-menu" label="Applications">
  <item label="Xterm">
    <action name="execute"><execute>xterm</execute></action>
  </item>
  <item label="Mozilla">
    <action name="execute"><execute>mozilla</execute></action>
  </item>
  <item label="Gaim">
    <action name="execute"><execute>gaim</execute></action>
  </item>
  <item label="Quark">
    <action name="execute"><execute>strange-quark</execute></action>
  </item>
</menu>

<menu id="root-menu" label="Openbox 3">
  <menu id="apps-menu" />
  <menu id="games-menu" />
  <separator />
  <menu id="client-list-menu" />
  <separator />
  <item label="Reconfigure">
    <action name="reconfigure" />
  </item>
  <item label="Restart">
    <action name="restart" />
  </item>
  <item label="Exit">
    <action name="exit" />
  </item>
</menu>

</openbox_menu>