WeDevs\Dokan\Order\Manager

Dokan Lite main file dokan.php has a method called init_classes(), where instantiate requires classes and binds to the container. Inside init_classes() method, Dokan binds WeDevs\Dokan\Order\Manager(); class in container as order. With the help of this container, anyone can call  WeDevs\Dokan\Order\Manager‘s any method. Like-

dokan()->order->create_sub_order( $parent_order, $seller_id, $seller_products );

You also can use these methods-

Get a vendor’s all orders with some conditions

$args = [
    'seller_id'   => dokan_get_current_user_id(),
    'customer_id' => null,
    'status'      => 'all',
    'paged'       => 1,
    'limit'       => 10,
    'date'        => null,
];
dokan()->order->all( $args ); // return $orders; all order from a specific vendor.

This Order class also uses its funtions.php

Get a vendor’s all orders

Alternative funtion for dokan()->order->all( $args );

dokan_get_seller_orders( $seller_id, $status = 'all', $order_date = null, $limit = 10, $offset = 0, $customer_id = null ); 
// // return $orders; all order from a specific vendor.

Get a seller ID based on WooCommerce order. If Order has suborder, this method will return 0

$order_id = 10;
$seller_id = dokan_get_seller_id_by_order( $order_id );
// return 2

Get all sellers by an order

dokan_get_sellers_by( WC_Order $order );
// return all sellers.

Get a vendors total order number

$args = [
    'seller_id'   => $seller_id,
    'status'      => $order_status,
    'customer_id' => $customer_id,
    'date'        => $order_date,
]
dokan_get_seller_orders_number( $args );
// return 10. Total number of orders of a seller.