PO creation using BAPI

Hi All,

I have a requirement that I need to create a Purchase Order using BAPI  by uploading excel file which contains PO header data and Item data.

while creating the PO , info record also need to be craeted. if the PO already have inforecord , then its should be updated.

Now i  tranfered the data from excel file to internal table by using the function module  TEXT_CONVERT_XLS_TO_SAP .This internal table now contain both PO header and multiple line item.

1. How to pass this internal table to BAPI " BAPI_PO_CREATE1 "   to create  PO ? (internal table contain mutiple line item ).

2. How to create info record ?  if any FM available for both creating and updating info record?

3. If the info record cant be created, then PO should not be created.. how to acheive this?