Unable to import data for numbered list

Hi,

In my model, I have an employee list which has been created as a numbered list with combination of properties (Emp ID & Cost Centre) to identify uniq. Now i have create Employee Cost module to which i need to upload the actuals number. In my source file i have Emp ID & Cost center codes. Can someone suggest me which column i need to select to import data to Employee cost module.

Thanks,

Sangeetha