My Vehicles

To manage manufacturer, select menu "Extras" => "Manage manufacturer".

This opens the window "Manufacturer".

To add a new manufacturer, click on "New manufacturer". Enter the new name and click on "Save". To change a manufacturer, select one from the list, change the name and click on "Save". To delete a manufacturer, select one from the list and choose "Delete manufacturer" from the context menu.

You can't delete a manufacturer as long it has assigned vehicles.