Step 1: Navigate to the Project the time is assigned to and make sure the job the time is assigned to is selected

Step 2: Click on "view project sheet" (bottom left), see below image

Step 3: Click on the "timesheets" tab

Step 4: You will need to locate the timesheet record from the list and then delete it by clicking on the red "X" on the bottom right on the relevant record

All done, hope this article was helpful.