How to display products from several SECTION_IDs in Bitrix?

Question

1C-Bitrix

Please explain in a simple way how to display products from multiple SECTION_IDs. Only very simple, otherwise I'm in Bitrix 0.
there is this code:

<?$APPLICATION->IncludeComponent(
  "bitrix:catalog.section",
  "3inCol_rsv",
  Array(
    "COMPONENT_TEMPLATE" => "list",
    "IBLOCK_TYPE" => "Catalog",
    "IBLOCK_ID" => "5",
    "SECTION_ID" => "100",
    "SECTION_CODE" => "",
    "SECTION_USER_FIELDS" => array(0=>"",1=>"",),
    "ELEMENT_SORT_FIELD" => "sort",
    "ELEMENT_SORT_ORDER" => "asc",
    "ELEMENT_SORT_FIELD2" => "id",
    "ELEMENT_SORT_ORDER2" => "desc",
    "FILTER_NAME" => "arrFilter",
    "INCLUDE_SUBSECTIONS" => "Y",
    "SHOW_ALL_WO_SECTION" => "N",
    "PAGE_ELEMENT_COUNT" => "30",
    "LINE_ELEMENT_COUNT" => "3",
    "PROPERTY_CODE" => array(0=>"",1=>"",),
    "OFFERS_LIMIT" => "5",
    "TEMPLATE_THEME" => "blue",
    "MESS_BTN_BUY" => "Купить",
    "MESS_BTN_ADD_TO_BASKET" => "В корзину",
    "MESS_BTN_SUBSCRIBE" => "Подписаться",
    "MESS_BTN_DETAIL" => "Подробнее",
    "MESS_NOT_AVAILABLE" => "Нет в наличии",
    "SECTION_URL" => "",
    "DETAIL_URL" => "",
    "SECTION_ID_VARIABLE" => "SECTION_ID",
    "AJAX_MODE" => "N",
    "AJAX_OPTION_JUMP" => "N",
    "AJAX_OPTION_STYLE" => "Y",
    "AJAX_OPTION_HISTORY" => "N",
    "CACHE_TYPE" => "A",
    "CACHE_TIME" => "36000000",
    "CACHE_GROUPS" => "Y",
    "SET_TITLE" => "N",
    "SET_BROWSER_TITLE" => "N",
    "BROWSER_TITLE" => "-",
    "SET_META_KEYWORDS" => "N",
    "META_KEYWORDS" => "-",
    "SET_META_DESCRIPTION" => "N",
    "META_DESCRIPTION" => "-",
    "ADD_SECTIONS_CHAIN" => "N",
    "SET_STATUS_404" => "N",
    "CACHE_FILTER" => "N",
    "ACTION_VARIABLE" => "action",
    "PRODUCT_ID_VARIABLE" => "id",
    "PRICE_CODE" => array(),
    "USE_PRICE_COUNT" => "N",
    "SHOW_PRICE_COUNT" => "1",
    "PRICE_VAT_INCLUDE" => "Y",
    "BASKET_URL" => "/personal/basket.php",
    "USE_PRODUCT_QUANTITY" => "N",
    "ADD_PROPERTIES_TO_BASKET" => "Y",
    "PRODUCT_PROPS_VARIABLE" => "prop",
    "PARTIAL_PRODUCT_PROPERTIES" => "N",
    "PRODUCT_PROPERTIES" => array(),
    "DISPLAY_COMPARE" => "N",
    "PAGER_TEMPLATE" => ".default",
    "DISPLAY_TOP_PAGER" => "N",
    "DISPLAY_BOTTOM_PAGER" => "Y",
    "PAGER_TITLE" => "Товары",
    "PAGER_SHOW_ALWAYS" => "N",
    "PAGER_DESC_NUMBERING" => "N",
    "PAGER_DESC_NUMBERING_CACHE_TIME" => "36000",
    "PAGER_SHOW_ALL" => "N",
    "ADD_PICT_PROP" => "-",
    "LABEL_PROP" => "-",
    "MESS_BTN_COMPARE" => "Сравнить",
    "AJAX_OPTION_ADDITIONAL" => "",
    "PRODUCT_QUANTITY_VARIABLE" => "quantity"
  )
);?>

I need to display products from SECTION_ID = 100 and SECTION_ID = 7 in this block
, how to do it?

Answer 1

Simply put, no way. Only "in a complicated way"))
Your component is passed a filter with the name "arrFilter". Most likely, this filter is assembled using the Smart Filter component. So, you need to combine your filter by sections with Smart Filter. Only in this case will it be possible to achieve a result.