Questions about adapting the Depublication Cost Savings report

Greetings everyone;

I am new to DPA report customizing. I am using 6.2SP1 and I have a question about modifying the Deduplication Cost Savings report in the RIO section. I want to schedule that report to be sent via email once a month, but it needs a cost/gb as an input parameter, which has to be typed in interactively. I made a custom copy of this report, but I don't see how to modify the copy to automatically provide the requested input parameter, which is cost/gb. I tried drilling down into the individual tables in the report and I see where cost/gb variable is referenced and that it has a null value, but when I type in the value I want to provide into that field then try to view the result, I still have to interactively provide that value, which of course, won't work with a scheduled email report.

Ideally, I also want to limit this report to the 20 most expensive clients to back up.

Any suggestions on how to do that?