Of course you can. Here’s how:

In Weekly Timesheet:

1. Hover on any time log entry > Click on the edit option.
2. Click on ‘Delete icon’ option on extreme right to delete that particular time log entry.(Refer Image-1)
3. To delete all the time log entries for a task over the week, hover on the total hours for that task in timesheet page > click on the ‘Delete’ option.(Refer Image-2)

 In Daily Timesheet:

1. If you’re on the daily timesheet, click on the Delete icon at the extreme right for any task.(Refer Image-3)

                                         (Image-1) 

   (Image-2)

      Image-3