D7 выборка элементов с учётом подсекций

private function getElements(){
        $this->initPagination();
        if($currentSections = $this->findSections()){
            $this->setFilter(array_merge($this->filter, ['@IBLOCK_SECTION_ID' => $currentSections]));
        }
        $queryElements = $this->queryCatalog();
        $count = $queryElements->getCount();
        $this->pageNavigation->setRecordCount($count);
        [$prevLink, $nextLink] = $this->prepareLinkPagination(
            $this->pageNavigation->getCurrentPage(), $this->pageNavigation->getPageCount()
        );
        $pg = [
            'page_current' => $this->pageNavigation->getCurrentPage(),
            'page_size' => $this->pageNavigation->getPageSize(),
            'pages' => $this->pageNavigation->getPageCount(),
            'prev_link' => $prevLink,
            'next_link' => $nextLink,
        ];
        $items = $queryElements->fetchAll();
        $itemsId = array_map(fn($item) => $item['ID'], $items);

        $this->prices = $itemsId ? ProductPrice::getProductPrices($itemsId) : [];
        foreach ($items as &$item){
            $item = $this->prepareItem($item);
        }

        return [
            'items' => $items,
            'count' => $count,
            'pagination' => $pg
        ];
    }