Yes, it is possible to record additional time to a Fixed Price task that has been invoiced.
Have a look at similar frequently asked questions or visit our FAQs page for more information
Can TidyStock show customers' Purchase Order Numbers on the sales tab?
What is the notice period for cancellation?
Can I delete/ edit a time entry?
What is the timeline for migrating data from WorkFlowMax to TidyWork?
How do I enable and use the selective/partial invoicing?