As a manager with payroll user, you can Add Non-Employee by going to Management > Employee (Please follow through the steps below)
1. Select the Add icon on the right hand side
2. Select Non-Payrolled Employee and fill in the Add New Employee form and click Add Employee
3.) After adding, to view or change the settings of the non-payrolled employee. Select the Filter Icon and select Show non-payrolled employees only. A list of Non-Payrolled employees will be listed.