How to make an invoice when working in the Education Bureau?

How to issue invoices when working in the Education Bureau? If you work in the Education Bureau, you can invoice at this time or directly, because if he works in the Education Bureau, then you can have a good relationship with the Education Bureau and invoice at this time, because if you invoice at this time, you can see clearly the invoice he issued to the Education Bureau, so if you work in the Education Bureau, you can invoice at this time, that is, you can invoice manually.