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$arNabor3 = Array(
             "ITEM_ID"=>$arFields3[ID], 
               "QUANTITY"=>1,
                "SORT"=>100);
                                       
 if (!empty($arNabor3)) {
 $arNabor4[] = $arNabor3; // Все найденные наборы для данного товара , собираем в большой
 }                                  // Набор4, который и будем добавлять
  $arNabor3 = Null;
   }

   $arSaveSet = Array(
      "ITEM_ID" => $arFields2[ID],
      "SET_ID" => 0,
      "TYPE" => TYPE_GROUP,// тип 1 = комплект, 2 = набор
      "ITEMS" => $arNabor4,
      );

Array
(
    [ITEM_ID] => 22616
    [SET_ID] => 0
    [TYPE] => TYPE_GROUP
    [ITEMS] => Array
        (
            [0] => Array
                (
                    [ITEM_ID] => 19026
                    [QUANTITY] => 1
                    [SORT] => 100
                )

            [1] => Array
                (
                    [ITEM_ID] => 13186
                    [QUANTITY] => 1
                    [SORT] => 100
                )

        )

)

$setId = CCatalogProductSet::add($arSaveSet);