Invoice Approval Spreadsheet

Hi Gurus:

I am trying to upload a spreadsheet for invoice approval workflow. The problem is that, for invoices non matched against a PO, I want to use several approval groups, one for each distribution cost center. Do you know how to fill in the excel file with this? I try to do it but I get an error and the message is empty.

For example:

CC = 1000 --> Approval Group A

CC = 1100 --> Approval Group B

CC = 1200 --> Approval Group C

Thanks in advance.