How do I remove the whole \"Promo\" menu item from the Admin menu? It seems to be no separate module.
Method 1 - Using local.xml
Open /app/etc/local.xml and add the 'adminhtml' tag below
<config>
<global>
.....
</global>
<admin>
....
</admin>
<adminhtml>
<menu>
<promo translate="title" module="promo">
<depends><module>HideMe</module></depends>
</promo>
</menu>
</adminhtml>
</config>
Method 2 - Creating a Custom Module
Create /app/code/local/MagePal/RemovePromoMenu/etc/config.xml
<config>
<modules>
<MagePal_RemovePromoMenu>
<version>0.9.5</version>
</MagePal_RemovePromoMenu>
</modules
<adminhtml>
<menu>
<promo translate="title" module="promo">
<disabled>1</disabled>
</promo>
</menu>
</adminhtml>
</config>
Create /app/etc/modules/MagePal_RemovePromoMenu.xml
<?xml version="1.0"?>
<config>
<modules>
<MagePal_RemovePromoMenu>
<active>true</active>
<codePool>local</codePool>
</MagePal_RemovePromoMenu>
</modules>
</config>
@dsueiro Removing an Item from Magento's Admin Panel Navigation