[Lynne]

This is very, very basic - cpnav_productname.xml:

<?xml version="1.0" encoding="ISO-8859-1"?>

<navgroups product="product_id" master="true">
    <navgroup phrase="default" permissions="canadminstyles" displayorder="15">
    
        <navoption displayorder="10">
            <phrase>added_phase1</phrase>
            <link>link.php?do=something</link>
        </navoption>

        <navoption displayorder="20">
            <phrase>added_phase2</phrase>
            <link>link.php?do=something2</link>
        </navoption>
    
    </navgroup>
</navgroups>

Things to note:
product_id - is the product id from your product
default - these are phrases. I think they need to be global phrases
canadminstyles - your permissions for who can see this
15 - the display order - you can see what the default ones for vbulletin are in the cpnav_vbulletin.xml file