Для мелких проектов
$arFields = $ob->GetFields();
$arSec[$arFields["IBLOCK_SECTION_ID"]][] = $arFields;
$arProps = $ob->GetProperties();
$arFields = $ob->GetFields();
$arFields['PROPS'] = $ob->GetProperties();
$arSec[$arFields["IBLOCK_SECTION_ID"]][] = $arFields;