Purchase invoice

I am creating a text file with data like

"Invoice","1026","8625-W","Mani","Naaz","Vijaywada"
"Invoice","1028","10000","Item","1000","GREEN","FINISHED","laptop"

by using data port I can import the above text file.When I am running a purchase invoice I want to get one line in purchase header and next line in purchase line.how it will possible and how data items should be added in data port please tell me.