Executing the report program in Background

Hi All,

I have a reqiurement that to create a program for automatic PO creation by using the data provided in the excel file.So i created  a report program using BAPI "BAPI_PO_CREATE1" to generate PO. I am having the legacy file (excel file) in my presentation server (desktop).  while execution i wil upload this excel file.

Now i need to run this program in background. Is it possible to run this in Background?

If then how to upload this excel file in background ?