How to Create SLA for the AR Adjustment process

Summary: We would like to know the possibility of creating an SLA for the AR Adjustment process. We currently adjust out most of the marketing AR invoices and some of the Chilled Water Invoices. These are for intercompany charges. This is done manually, one by one, by the user. The adjustment is put to an expense account based on th4e customer, different depts for different customers.

An example would be Invoice# 2773092.

AR Account 018000.708.120800.000000.00000

Revenue Account 018000.708.590820.0000000.00000

This transaction was adjusted out to account 065265.799.810750.000000.00000

We would like a SLA for when the adjustment process was ran to go in and look at the customer, see what department the customer is mapped to, look at the invoice memo line to se what expense account it is mapped to, and that would be how the adjustment accounting would happen. I am not sure of the possibilities of this but we are thinking outside of the box on this one. Please review and let me know if you need anything else.