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<?
$res = CIBlockSection::GetList(
		Array('name' => 'asc'),
		Array('IBLOCK_ID' =>'5' , 'ACTIVE' => 'Y')
	);
while ($row = $res->GetNext())
{
	echo $row['NAME'].'<br>';
	$rsParentSection = CIBlockSection::GetByID($row['ID']);
	if ($arParentSection = $rsParentSection->GetNext())
	{
	   $arFilter = array('IBLOCK_ID' => $arParentSection['IBLOCK_ID'],'>LEFT_MARGIN' => $arParentSection['LEFT_MARGIN'],'<RIGHT_MARGIN' => $arParentSection['RIGHT_MARGIN'],'>DEPTH_LEVEL' => $arParentSection['DEPTH_LEVEL']); // выберет потомков без учета активности
	   $rsSect = CIBlockSection::GetList(array('left_margin' => 'asc'),$arFilter);
	   while ($arSect = $rsSect->GetNext())
	   {
		   echo '---'.$arSect['NAME'].'<br>';
	   }
	}
}
?>