Show custom taxonomy not in submenu

So, what you are trying is to add manufactures taxonomy for product post type of Woocommerce Plugin?

Change manufactures object type to product and it should work.

register_taxonomy( 'manufactures', 'product', array(
    'hierarchical'      => true,
    'labels'            => $labels,
    'query_var'         => true,
    'show_admin_column' => false,
    'show_ui'           => true
) );