Custom post type sem opção de criar novos posts (remover Adicionar Novo)

Solucionado com o código passado pelo Guga Alves:

register_post_type( 'custom_post_type_name', array(
  'capability_type' => 'post',
  'capabilities' => array(
    'create_posts' => false, // Removes support for the "Add New" function
  )
  'map_meta_cap' => true, // Set to false, if users are not allowed to edit/delete existing posts
));