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 customers filter by Tracking Categories in Advanced Search?
What are the differences between the user roles?
Can I copy an old purchase order to a new purchase order rather than having to rewrite it?
Can TidyStock be used for stock taking, and profit and loss analysis in a bar setting?
We're a non-profit organisation, are there any special pricing plans available?