<?php

CModule::IncludeModule("iblock");
CModule::IncludeModule("sale");
CModule::IncludeModule("catalog");
$CATALOG_IBLOCK_ID = "14";
$OFFERS_IBLOCK_ID = "15";
$MAIN_SECTION_ID = "880";


$arSort = array("SORT" => "ASC");
$arFilter = array("IBLOCK_ID" => $CATALOG_IBLOCK_ID, "ID" => $MAIN_SECTION_ID, "ACTIVE" => "Y", "GLOBAL_ACTIVE" => "Y");
$cSection = CIBlockSection::GetList($arSort, $arFilter);
if($cSection = $cSection->GetNext())
{
    $arFilter = array("IBLOCK_ID" => $CATALOG_IBLOCK_ID, '>LEFT_MARGIN'=>$cSection['LEFT_MARGIN'],
        '<RIGHT_MARGIN'=>$cSection['RIGHT_MARGIN'], "ACTIVE" => "Y", "!ID" => $cSection["ID"]);
    $rsSections = CIBlockSection::GetList($arSort, $arFilter);

    $arResult['SECTION'] = array();
    while ($arSection = $rsSections->GetNext()) {
        $arResult['SECTION'][$arSection['ID']] = $arSection['ID'];
    }

    $elements = "";
    $arOrder = array("SORT" => "ASC");
    $arFilter = array("ACTIVE" => "Y", "INCLUDE_SUBSECTIONS" => "Y", "IBLOCK_ID" => $CATALOG_IBLOCK_ID, "SECTION_ID" => $MAIN_SECTION_ID);
    $rsElements = CIBlockElement::GetList($arOrder, $arFilter, FALSE, FALSE);
    while ($arElement = $rsElements->GetNextElement())
    {
        $fields = $arElement->GetFields();
        $props = $arElement->GetProperties();

        $arOrder = array("SORT" => "ASC");
        $arOffersFilter = array("ACTIVE" => "Y", "IBLOCK_ID" => $OFFERS_IBLOCK_ID, "PROPERTY_CML2_LINK" => $fields["ID"]);
        $rsOffersElements = CIBlockElement::GetList($arOrder, $arOffersFilter, FALSE, FALSE);
        while ($arOffer = $rsOffersElements->GetNextElement())
        {

            if (!$arResult['SECTION'][$fields["IBLOCK_SECTION_ID"]]) {

                $db_old_groups = CIBlockElement::GetElementGroups($fields["ID"], true);

                $ar_new_groups = array($NEW_GROUP_ID);
                while($ar_group = $db_old_groups->Fetch())
                {
                    echo '<pre>';
                    var_dump($ar_group);
                    echo '</pre>';
                }
            }
        }
    }
}