How to display node/add/sometype form on another page?

Question

The whole problem is following:

Lets say we have Items, Items can have Bids, Items can have Questions and Question can have Answer.

When an Item is displayed

Answer 1

module_load_include('inc', 'node', 'node.pages');

$form = node_add('nodetype');
$output = drupal_render($form);

If your node form has a file upload widget, you should add the following lines to the menu array:

'file path' => drupal_get_path('module', 'node'),
'file' => 'node.pages.inc',