Year End Process - Should we closed all the POs?

Year End Process - Should we closed all the POs so the remain $ amount on the POs will affect next year's budget?

Every year, our company has to go through a prolong Year End process because Lawson does not allow two active budgets. Below are the stpes:
1.close all the POs prior to year end and accure the remaining $ amount on the POs to an Accural account.
2. Open requisitions for those POs against the Accrual account so we can pay Decemeber's invoices.
3. Load new budget.
4.Open requisitions for the POs funded for multiple years so we can pay the January invoices.

Is there a better way to handle those multi-year, multi budget POs?

Thank you very much!

Anna