AddSection By Regions

CModule::IncludeModule('iblock');
CModule::IncludeModule('sale');

$iblockId = 128;

$locs = COption::GetOptionString('rbs.moyskladstocksextended', 'locations_config');
$locs = explode('|', $locs);

$sec = new \CIblockSection;
foreach($locs as $loc){
    $locOb = CSaleLocation::GetById($loc);
    $cityName = $locOb['CITY_NAME'];
    $cityCode = \CUtil::translit($cityName, 'ru');

    $check = \CIblockSection::GetList([], ['IBLOCK_ID' => $iblockId, '=CODE' => $cityCode]);
    if($check->GetNext()) continue;


    $sec->Add([
        'IBLOCK_ID' => $iblockId,
        'CODE' => $cityCode,
        'NAME' => $cityName
    ]);
}