CM - Bank Reconciliation - Opening Unreconciled Transactions

Summary:

We are planning to implement cash management module in an instance where GL, AP and AR are already implemented and gone live. We are planning to add the Reconciliation start date as the date we start the reconciliation.

What's the best method to bring in the opening unreconciled items? For example there are payments in the bank statement which are originated in a previous period in the cash book.

What's the best method to handle these?