Note : This method is not recommended, prefer to use order by order mode

1. Select orders to prepare and and add them in the "In progress" tab
   
2. Print the picking list and pick products in the warehouse
   
3. Mass create order shipments
   
4. Print all shipping labels
   
5. Pack the order offline
   
6. (optional) Import tracking numbers

Note : shipping step is optional, you dont need it if you use only API carriers

Step by step process

1. Add multiple orders to In progress tab at once by navigating to Sales > Order preparation > In stock. Select all the orders to be prepared in bulk. Choose the Prepare option from Bulk actions dropdown and click on Submit button. 

1. Following the above process will move the selected orders to In progress tab. 

1. Click on the button Picking in the bottom right corner. This helps in downloading the global picking list to pick products from the warehouse.

1. Once the picking is done, click on button Mass create shipment and invoices button. This will create shipments for all orders in the In progress tab. 

1. Click on the button Download PDF to get a PDF with all packing slips and invoices

1. Click on Shipping button and download labels per carrier. 
   

1. If you have non API carriers, you must import tracking numbers from a CSV file, from the "shipping" button :