How to transfer opening balance from one ledger to another ledger?

We have ABC PL which has two secondary ledgers ABC SL and 123 SL. There are two consolidations defined ABC PL to ABC SL (transfer all data except for ABC022 cost centre) and ABC PL to 123 SL (transfer data only for ABC022 cost centre)

Our client has a requirement where he want to make 123 SL Secondary ledger redundant i.e now only ABC SL shall display the all the data present in ABC PL (including ABC022 cost centre's).

In order to make this haopen, I have tried to transfer balance present in 123 SL to ABC SL by creating a new consolidation. But this is just letting the period activity getting transferred and not the opening balance which is again creating the difference. Explained with an example