IO settlement with multiple characteristics

Hi All,

I have a requirement that discount amount will be captured in FI books along with IO. Now i want to settle this IO to PA segment with multiple customers, Material codes, DIVision, D.c etc..

Ex:Discount amount:10,000  and IO NO:AAAA-FI

Need COPA: Rs1000-Customer 1, Divsion 10, DC: 10 Material code:X1  (Amount Segregation manually)

                    Rs 2000 Customer2, division 20 DC: 10 Material code X2

                    Rs 4000 Customer 3, division 30 Dc: 20 material code: x3

                    Rs 3000 Customer 4, Division 40, DC:30 Material code:x4

How to make settlement rule  and settlement will be done on reguular basis... plz suggest