How to set up filtering of search results in Bitrix?

Question

1C-Bitrix

Hello! Guys, such a question.
There is a search.page component, it has this:

$arFilter = array(
    "SITE_ID" => SITE_ID,
    "QUERY" => $arResult["REQUEST"]["~QUERY"]
);
$obSearch->Search($arFilter, array("RANK" => "DESC"), array('STEMMING' => false));

The Bitrix API says that you can filter the results by the type of infoblock, its id, and something else. And I need to filter by two sections. In general, I have a directory, inside it there are two categories. 1) Technique. 2) Spare parts.
I need the search to search, for example, only from the spare parts section. How to do something like this?