<?php

/**
 * @orm\entity
 */
class Entity
{
    /**
     * @orm\column
     * @var string
     */
    private $name;
    /**
     * @orm\column
     * @var string
     */
    private $slug;
    /**
     * @orm\column
     * @var string
     */
    private $foo;
    /**
     * @orm\column
     * @var string
     */
    private $bar;
}

$entity = new Entity;

$form = new Kdyby\Doctrine\Forms\Form($entity, ...);
$form->builder->add('name', 'slug'); // mapuje name a slug

$form['something'] = new Kdyby\Doctrine\Forms\EntityContainer($entity);
$form['something']->builder->add('foo', 'bar'); // mapuje foo a bar - vkládá se do formu