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 Tidy handle 5000 quotes in the system, 15+ custom quote templates, and offer billable and non-billable costs?
Where can sales acknowledgement files be found?
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Can I assign a salesperson to a sale?
Why is the 'processing' button spinning and not allowing me to generate an assembly in TidyEnterprise, despite all BOM materials being available?