Is it possible to add a Reconciliation Reference to already posted transactions automatically

Dear reader,

Is it possible to add a Reconciliation Reference to already posted transactions automatically, so not via Reconcile Clearing Accounts Manually and entering the reference numbers manual?

We have 5 years of data in a GL account that we need to start reconciling and doing this manual will be way to much work, so i was wondering if there is another way of getting the references in automatically. ( This GL account is a receiving account for inventory goods before they are moved into the warehouse. Another GL account that we have to start using the Reconcilitaion Reference is the unapplied receipt account, AR module and the Asset clearing account)