This how to article will show you how to add more brands / manufacturers to your Magento Commerce store.
Manufacturer / Brand is an attribute setting, so the following procedure is the same for adding any extra fields to other attributes.
> In the Admin panel
> hover over the ‘catalog’ button on the menu bar.
> go to ‘attributes’ >> ‘Manage Attributes’
> find ‘Manafcturers’ and click on the attribute name
> on the left hand side click on the ‘Manage Label/Options’ tab
> underneather Manage Options on the main part of the screen click on ‘Add option’
> enter the text of the new manufacturer you want to add.