这是您要寻找的东西吗??

is this is what You are looking for :?

将此问题放在您在问题中提到的if之后.

Put this after if that You mentioned in Your question.

$fieldset->removeField('created_in');
$fieldset->addField('created_in', 'select', array(
   'name'      => 'created_in',
   'label'     => Mage::helper('adminhtml')->__('Created In'),
   'id'        => 'created_in',
   'title'     => Mage::helper('adminhtml')->__('Created In'),
   'class'     => 'input-select',
   'style'     => 'width: 80px',
   'options'   => array(
   //Put here list of websites || stores || store views
      'key_1' => 'VALUE_1', 
      'key_2' => 'VALUE_2'
   ),
), 'website_id');