How to migrate existing budget data to new budget?

Summary:

Currently, the client is operating with two active budgets—Capex and Opex—under Encumbrance Accounting. In line with recent business requirements, there is a mandate to implement the new budgets with revised budget structures. Additionally, this migration is scheduled to occur mid-year, adding to its criticality.

Could someone pls guide us on how to migrate the budgets transactions/balance from the existing to new, considering below scenarios:

Controlled Budgets with Encumbrance Accounting

PRs Rejected
PRs Returned
PRs Pending Approval
PRs Approved not linked with PO or Neg
POs Pending Approval
POs Approved not Received
POs Approved Received Partial
POs Received not invoiced