Australia's Leading Keep-It-Simple Accounting Software

Can I use my existing unlock code to register another Cashbook?

No.  It’s not possible to re-use an existing code to register another data file (even if you’ve set up the new cashbook data file with the same organisation name you had when you purchased) because each data file needs to be registered (purchased) separately.  However, additional registrations are available for just half-price.  Please contact support if you need to get a half-price registration.