If you want to bill some services in addition to the stipulated sum (or fixed fee), time entries can be recorded against those additional service job codes and then billed to the client. To accomplish that in ArchiOffice/EngineerOffice:
1. While setting up phases in the Projects > Details tab, specify the Additional Services Job Codes for the desired phases.
2. When time entries are recorded against this phase, select the Additional Services Code Type.
3. You may also set up a budget on the Projects > Billing > Budgets tab with Additional Services job code.
4. Additional Services can be set with a bill rate specified by the Job Code (instead of the employee's rate). For example, the Administration job code can be set to $100 Bill Rate in the Projects>Details>Job Codes tab. When you record time using this job code, the updated rate is used.
5. If a Current Invoice Amount is entered on the Projects > Billing > Options screen, ArchiOffice will bill this phase and add Administration time as additional services (@ $100/Hr).
6. Create an invoice for this project phase. The basic and additional services are listed separately on it.