src/Controller/OrdersController.php
src/Controller/Orders/PositionsController.php

/orders > OrdersController
/orders/details/1 > OrdersController:details
/orders/positions/details/1 > PositionsController:details

Router::scope('/', function (RouteBuilder $routes)
{
    $routes->connect('/orders/details/*', [
        'controller' => 'Orders',
        'action' => 'details'
    ]);
    $routes->prefix('orders', function (RouteBuilder $routes)
    {
        $routes->fallbacks(DashedRoute::class);
    });
    $routes->fallbacks(DashedRoute::class);
});

src/Controller/OrdersController.php
src/Controller/Orders/PositionsController.php
src/Controller/Orders/Positions/CommentsController.php