How to connect sub menu with static menu!?

Question

1C-Bitrix

Good afternoon!
How to connect a dynamic submenu to a static menu in Bitrix!?
We have code:

<?
$aMenuLinks = Array(
  Array(
    "Каталог", 
    "catalog/", 
    Array(), 
    Array(), 
    "" 
  ),
  Array(
    "О компании", 
    "about/", 
    Array(), 
    Array(), 
    "" 
  ),
  Array(
    "Доставка", 
    "faq/delivery/", 
    Array(), 
    Array(), 
    "" 
    )
);
?>

Need to:

Array(
    "Каталог", 
    "catalog/", 
    Array(), 
    Array(), 
    "" 
  ),

Connect the dynamics, what would be under the menu:

- каталог
-- каталог/раздел (динамика - инфоблок)
-- каталог/раздел (динамика - инфоблок)
- о компании
- доставка

Answer 1

In the menu settings, set the nesting level to 2, the menu type for the remaining levels is "Left Menu"
In the folder to which the first link leads Directory, put the file left.menu_ext.php
Add the following code to the file

<?
if(!defined("B_PROLOG_INCLUDED") || B_PROLOG_INCLUDED!==true)die();

global $APPLICATION;

$aMenuLinksExt=$APPLICATION->IncludeComponent("bitrix:menu.sections", "", array(
  "IS_SEF" => "Y",
  "SEF_BASE_URL" => "",
  "SECTION_PAGE_URL" => "#SECTION_ID#/",
  "DETAIL_PAGE_URL" => "#SECTION_ID#/#ELEMENT_ID#",
  "IBLOCK_TYPE" => "products",
  "IBLOCK_ID" => "2",
  "DEPTH_LEVEL" => "1",
  "CACHE_TYPE" => "A",
  "CACHE_TIME" => "36000000"
  ),
  false
);

$aMenuLinks = array_merge($aMenuLinks, $aMenuLinksExt);

?>

where IBLOCK_ID - ID of your infoblock

Answer 2

Now we are on /m/
But, it’s not like that, it doesn’t want to connect (((
file /m/catalog/left.menu_ext.php - with the above code lies (id is specified)