BasePress support knowledgebase

function pm_kb_categories_query($query, $old_query, $uri_parts, $pm_query, $content_type) {
    if(isset($query['knowledgebase_cat']) && !empty($pm_query['id']) && strpos($pm_query['id'], 'tax-') !== false) {
        $query['post_type'] = 'knowledgebase';
        unset($query['taxonomy']);
        unset($query['term']);

        $term_id = intval(preg_replace("/[^0-9]/", "", $pm_query['id']));
        $term = get_term($term_id);

        if(empty($term->parent)) {
            $query['is_knowledgebase_product'] = 1;
        }
    }

    return $query;
}
add_filter('permalink_manager_filter_query', 'pm_kb_categories_query', 5, 5);