How to divide GL journal batches imported from subledgers by Business Unit?

Summary:

Customer Organization has a primary ledger linked to multiple BUs (each with own PBSVs), GL Data Access Set is then used to ensure BU users can see journals of their own BUs.

Customer Organization doesn't have GL approval on journals imported from subledgers

Content (required):

As some users may run the Create Accounting, with Posting option set to F.

Since Create Accounting will group all the BUs subledger journals and import into 1 single GL journal batch in GL. When they click Post in GL module, they don't have enough access as they have data access set only on their own BUs, but the journal batches group all the BUs' subledger journal.