multiple payment terms for receivables

Hello dear SAP experts,

I need anysorta solution for my payment term setting problems (erp 4.6 / 6.0). For one of our area need set up this payment terms:

due date - 60 days, terms are 6% discount in case of payment in 10 days, 5% discount in 20 days, 5% disc. in 30 days, 4% disc. in 40 days... and so on (6 terms).

How can i solve this problem? I know so i can divide payments by days limits for "before 15th" and "after 15th" of given-month what means 4 terms... but i had never worked with it. I mean i set payment terms but they weren't multiple types...

Thank you in advance!

Tomi