Special GL - alternate reconciliation accounts

I'm have difficulty bringing together the concept of Special GL accounts and Alternate Reconciliation accounts as they relate to customer invoices. Can anyone help point me in the right direction?

We have a requirement to create a separate A/R subledger to collect a specific goup of A/R invoices. These need to be aged separately and the A/R needs to be separately identifyable in the Balance Sheet. A Special GL account seems to be the best way to solve these requirements but I am not able to sucessfully match the Special GL configuration with the SD invoice billing.

I would appreciate any thought or help on this issue.

Thanks,

Jeff