SetPropertyValuesEx

$section_list = array();

while ($arOtrasliItem = $rsOtrasliItem->Fetch())                  
{                  
   $db_sec = CIBlockSection::GetList(array(), 
      array(
         "IBLOCK_ID" => IBLOCK_OTRASLI,
         "XML_ID" => $arOtrasliItem['VALUE']
      ),
      false,
      array('IBLOCK_ID', 'ID')
   );      

   if($ar_sec = $db_sec->Fetch())
      $section_list[] = $ar_sec['ID'];                                       
}

if(!empty($section_list))
{
   $props['OTRASLI'] = $section_list;               
   CIBlockElement::SetPropertyValuesEx($elid, IBLOCK_CATALOG, $props);               
}

$arFields = Array(
   "ELEMENT_META_TITLE" => "Заголовок страницы",
   "ELEMENT_META_DESCRIPTION" => "Описание страницы",
   "ELEMENT_META_KEYWORDS" => "Ключевики",
);
$ipropTemplates = new \Bitrix\Iblock\InheritedProperty\ElementTemplates($IBLOCK_ID, $ID);
$ipropTemplates->set($arFields);

// Здесь регистр игнорируется 
CIBlockElement::GetList([], ['PROPERTY_ORDERID' => 10], false, false, ['ID']); 
// А здесь нет 
CIBlockElement::SetPropertyValuesEx(5996, 9, [ 
    'orderID' => 123 
]);

\Bitrix\Iblock\PropertyIndex\Manager::updateElementIndex(инфоблок, элемент);

/** @var $obRequest \Bitrix\Main\HttpRequest */if (!empty($obRequest->getFile('ATTACHMENT'))) {
    $arFiles = $obRequest->getFile('ATTACHMENT');
    ksort($arFiles);

    foreach ($arFiles['error'] as $k => $v)
    {
        if( $v < 1 )
        {
            $arPhopFiles[] = ['VALUE' => array_combine(array_keys($arFiles), array_column($arFiles, $k)), 'DESCRIPTION' => ''];
        }
    }

    \CIBlockElement::SetPropertyValuesEx(ELEM_ID, IBLOCK_ID, ['ATTACHMENT' => $arPhopFiles]);
}

$IBLOCK_ID = 26;
$res = CIblockElement::GetList([], ["IBLOCK_ID" => $IBLOCK_ID, "NAME" => "%Huawei%"], false, false, ["ID"]);
while ($ob = $res->GetNext()) {
    CIblockElement::SetPropertyValuesEx($ob["ID"], $IBLOCK_ID, ["MANUFACTURER" => 113]);
}