Time report initial booking, finished earlier.
Send request for done work on another Project (ad-hoc) to Producer
Producer has to accept request and book it to project.
Choose NO on the ‘Do You Want To Add Time report For This Expired Booking?
So the Artist doesn’t need to time report the booking again. The Used will be the Booked time.
As alternative you can use 'Ad-Hoc Time Reporting'.