In a calculation for a deliverable you define the activities that your team needs to do to complete it. Also costs of material can be entered. After a calculation, the costs for completing a deliverable and the cash it should bring in are defined.
For deliverables with time and material costs, a calculation is needed before time can be registered and VOGSY can generate invoices.
For deliverables with a fixed price, a calculation is not necessary. Still calculations can be added for the the internal administration of your company.
Add a calculation for a deliverable via the options (see screenshots).