In case you’re confused, this new feature refers to the Reconcile routine, a troubleshooting utility, not reconciling the GL to a sub ledger.
You no longer need to select one year at a time to reconcile! You can now select “All” to have Dynamics GP reconcile through the years oldest to newest.
In the Reconcile Financial Info…
— Read on community.dynamics.com/gp/b/dynamicsgp/posts/automate-full-general-ledger-reconcile