Go to Settings -> Navigation Manager

Click 'Add Tab'.

Enter as in image.



Now add the sub menu.
Select 'Add Link'



You will need to add 3 Links.







Now you need to add a Plugin

Go to Plugins & Products -> Plugin Manager

First - Disable the Plugin oscShop process_templates_complete

Now - Add New Plugin



This is the code for the Plugin
PHP Code:
if (substr(THIS_SCRIPT04) == 'osc_')
{
$request_tab 37;

This is where you get you Nav Tab ID
Go to Settings -> Navigation Manager
Click Edit for the Shop Tab.



You should now have a Shop Tab and Sub Menu showing in your Nav Bar.