ARCS Instance demerger

Summary:Client is demerging its business in two entities(assume A and B). The Current instance will be used for B only going forward and A will be carved out from it. But for A, in the new instance client is asking for 6 months historical data (April - September) for transaction matching related to A. For that i will need Mar cut off data which client will provide (i.e. unmatched transactions for March) , is there any way we can take Apr to Sept data for entity A from current instance (A B) to new instance (A). please advise. Please