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$rs = CIBlockElement::GetList (
Array("PROPERTY_SERVICE.SORT" => "ASC"),
Array("IBLOCK_ID" => $IBLOCK_ID),
false,
Array ("nTopCount" => 5)
);

while($arItem = $rs->GetNext())
{
?><pre><?print_r($arItem)?></pre><?
}

$rs = CIBlockElement::GetList (
Array("SORT" => "ASC"),
Array("IBLOCK_ID" => $arItem["LINK_IBLOCK_ID"], "ID"=>$arItem["PROPERTIES"]["SERVICE"]["VALUE"]),
false,
Array ("nTopCount" => 5)
);