How to import data into SAP B1 system in order to create new Sale Order object

I'm integrating SAP B1 and another system (such called DMS). I've watched the training video "How to build a B1 to File scenario". This video gave a demo how to export Sale Order object to a file system. So, I wonder how can I import some necessary information from my DMS system to SAP B1 to create a Sale Order object successfully ?

Thanks !