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In the menu, select assumptions/costs/personnel. Then change the "Employee Count" column entries for the years for the desired employee type.
Related Questions:
How do I add or change employees? / How do I add or change personnel?
How do I change the salary of an employee?
How do I indicate an employee is not paid?
How do I indicate an employee is working part time?
How do I change the annual raise of all employees?
How do I change the annual raise of just one employee?