[Yellow Slider]

In order to create a new nav group, create a new file called cpnav_product_id.xml:

<navgroups product="product_id">
    <navgroup text="Group Title" displayorder="10">
        <navoption displayorder="10">
            <text>First Option</text>
            <link>example.php</link>
        </navoption>
        <navoption displayorder="20">
            <text>Second Option</text>
            <link>example.php</link>
        </navoption>
    </navgroup>
</navgroups>

Then upload it to includes/xml.