How can i use embed forms or simgle form fields depend on a form field?

You have a register form with a field account_type and two embed forms Company and Address.

You want remove the embed Company form, when the field account_type is sfGuardUserProfile::TYPE_PRIVATE otherwise you want remove the embed Address form.

The solution is to override the bind method in your form.

  public function bind(array $taintedValues = null, array $taintedFiles = null)
  {
    // unset request param and validator
    if($taintedValues['account_type'] == sfGuardUserProfile::TYPE_PRIVATE)
    {
      unset(
        $taintedValues['Company'],
        $this->validatorSchema['Company']
      );
    }
    else
    {
      unset(
        $taintedValues['Address'],
        $this->validatorSchema['Address']
      );
    }
 
    parent::bind($taintedValues, $taintedFiles);
  }