You press "User Operations" tab and then click "User Authorized" from control panel. After selecting the related staff here, come "CRM Activity" tab. Appointment book of the selected staff can be set on which staff's privileges (see, add, delete, edit) here. You can make the process in related staff appointment book according to records what you've made.
To follow the authorized (SYSDBA) user's activities for other users you can make the relevant authorities from "Program Usage Authorities" tab=>CRM=>CRM Activities section.