Magento Add Child Menu in Admin Section

Step : 1
open Your project Folder\app\code\local\NameSpace\ModuleName\etc\config.xml file

Step : 2
find

<adminhtml>
    <menu>

    </menu>
</adminhtml>

Step : 3
and add this

<adminhtml>
    <menu>
      <news module="news">
        <title>News</title>
        <sort_order>71</sort_order>
        <children>
          <items module="news">
            <title>Manage News</title>
            <sort_order>0</sort_order>
            <action>news/adminhtml_news</action>
          </items>
 <itemsone translate="titl" module="news">
<title>Manage Comments</title>
<sort_order>1</sort_order>
  <action>news/adminhtml_news</action>
</itemsone>
        </children>
      </news>
    </menu>
</adminhtml>