Can we have an external system send a "detail" interface to a custom subledger?

Can we have an external system feed detailed accounting lines to either a custom subledger we create or an existing one (like receivables sla), and then let that subledger summarize to transfer to the GL?

Our use case is implementation of Campus Solutions, and it's loosely stated in PeopleBooks that there's a supported interface from Student Financials in Campus Solutions over to EBS General Ledger. But it's in Detail. We'd like to keep that as is - in detail - but then feed it into a subledger module in EBS so that we have the detail there, and then summarize to GL (we always do summary level in our GL).