GetList

$arFilter = Array("IBLOCK_TYPE"=>$arParams['IBLOCK_TYPE'], "ACTIVE_DATE"=>"Y", "ACTIVE"=>"Y");  
$arrayMasAnalogs = array("LOGIC" => "OR");
foreach ($mas_analogs as $arAnalog) {
        $arrayMasAnalogs[] = array(
            'LOGIC'=>'AND',
            array('PROPERTY_ECH_PRODUCER.NAME'=>$arAnalog['SUP_BRAND'],
                'PROPERTY_ECH_CODE'=>$arAnalog['ART_ARTICLE_NR'])
        );
    }
 $arFilter[] = $arrayMasAnalogs;

PROPERTY_ECH_PRODUCER  - свойство типа "привязка к элементу инфоблока". Производителя ищем по его названию. 

PROPERTY_ECH_CODE  - свойство типа "строка".

'PROPERTY_DATE'=>date('Y-m-d H:i:s',mktime($arEventDate['HH'], $arEventDate['MI'], $arEventDate['SS'], $arEventDate['MM'], $arEventDate['DD'], $arEventDate['YYYY']));  

$date = '24.15.2015 12:10:00';
$date2 = strtotime($date) - CTimeZone::GetOffset();

$arFindElFilter = array(
    'IBLOCK_ID' => $id,
    'ACTIVE' => 'Y',
    'PROPERTY_DATE' => date('Y-m-d H:i:s',$date2),
);

$arFindElSelectFields = array(
    'IBLOCK_ID',
    'ACTIVE',
    'PROPERTY_DATE',
);

$el = new CIBlockElement;

$rsFindEl = $el->GetList(
    array(),
    $arFindElFilter,
    false,
    false,
    $arFindElSelectFields
);

while ($findEl = $rsFindEl->Fetch())
{
    print_r($findEl);
}

'checkOutOfRange' => true

$navparams = array(
    'nTopCount' => false,
    'nPageSize' => $this->params['ELEMENTS_COUNT'],
    'iNumPage' => intval($_REQUEST["page"]),
    'checkOutOfRange' => true
);

$arResult['PREV'] = $arResult['CURRENT'] = $arResult['NEXT'] = array();  

//предыдущая и следующая 
if (\Bitrix\Main\Loader::includeModule('iblock')) {
   $i = 0;
   $res = CIBlockElement::getList(array('SORT' => 'ASC', 'ID' => 'DESC'), array('ACTIVE' => 'Y', 'IBLOCK_ID' => $arParams['IBLOCK_ID']),
                           false, array('nElementID' => $element['ID'], 'nPageSize' => 1),
                           array('ID', 'NAME', 'PREVIEW_PICTURE', 'DETAIL_PAGE_URL'));
   while ($row = $res->getNext()) {
      $row['PREVIEW_PICTURE'] = CFile::GetFileArray($row['PREVIEW_PICTURE']);
      if ($element['ID'] == $row['ID']) {
         $arResult['CURRENT'] = $row;
      } elseif ($i > 0 && !empty($arResult['CURRENT'])) {
         $arResult['NEXT'] = $row;
      }
      if ($i == 0 && empty($arResult['CURRENT'])) {
         $arResult['PREV'] = $row;
      }
      $i++;
   }
}
 

$arFilter['PROPERTY_LOCATION'] = 't9DgyAPm'; //t9DgyAPm это значение поля UF_XML_ID элемента справочника

$arSelect=array("ID", "IBLOCK_ID", "CATALOG_GROUP_<ID типа цены>");

CATALOG_PRICE_<ID типа цены>

$arSelect = Array("ID", "IBLOCK_ID", "CODE", "NAME", "PROPERTY_HTML_CONTENT");
$arFilter = Array("IBLOCK_ID"=>$infoblocks, "ACTIVE_DATE"=>"Y", "ACTIVE"=>"Y");
$res = CIblockElement::GetList(Array("DATE_CREATE" => "DESC"), $arFilter, false, $arPages, $arSelect);
 while($ob = $res->GetNextElement()){
   $arFields = $ob->GetFields();
   $content = $arFields['PROPERTY_HTML_CONTENT_VALUE']['HTML'] ? htmlspecialcharsBack($arFields['PROPERTY_HTML_CONTENT_VALUE']['HTML']) : htmlspecialcharsBack($arFields['PROPERTY_HTML_CONTENT_VALUE']['TEXT']);
 }

$arFilter = Array("IBLOCK_ID"=>$_POST["IBLOCK"], 'PROPERTY_CML2_ARTICKLE'=>$ar,  'PROPERTY_ADRES_TOVARA_NA_SKLADE_VALUE'=>'%'.'P1-B4'.'%'  );