The printed purchase orders and transfers include a barcode to help you quickly find them from the purchase order list.
Once you have created your transfer or purchase order click the print button:
This will open another tab in your browser that you can then print from, right click on the page and click print selecting the printer you wish to print from, once you have the paper copy it should look similar to the below and have a barcode at the bottom of the page the represents the purchase order number:
Now when you need to find the purchase order quickly you can navigate to the purchase order list, once on the list click into the Purchase Order number field, you can now scan the barcode from the printed Purchase Order:
You can now continue working on the purchase order as needed.