To add an existing ledger to a new bookkeeping, open the Accounting form click the "Show Ledger Tree" button.
The buttons "Create New Ledger" and "Edit Ledger" appears.
Click on the "Edit Ledger" button to open the "Custom Ledger" form.
To use an existing ledger from a previous year, click on "INSERT" to create a new record. Now the "IMPORT" button appears.
Select an existing ledger to use and then click "IMPORT" to add the existing ledger to the current bookkeeping. See "Import Ledger" for more information aboout importing an existing Ledger