Copy the following files from your old Topaz Data folder to the new folder:
Extension.* ( This contails all Extension Details)
User*.* ( This contails all the Users)
Account.* ( This contains all the Account Code Details)
Master.* ( This contains all the Telephone Number Details)
Department.* ( This contains all the Departments)
Branch.* ( This contains all the Branches)
Section.* ( This contains all the Sections)
Copy only the parts that you want to move over to the new installation.