Discounts for multiple divisions

We are a single Org company.  We have 9 divisions which operate like an org under the single Org.  A Default Discount setup was done during implementation.  It is sending all the discounts to this account which is not correct.  We have a single lockbox so using the More Receivables Options won't do it.  We need the discount to remain with the division that created the AR.  Anyone have any suggestions on the best way to approach this?