You may have different options available to you depending on your system's configuration. If you do not see the Overwrite With button, you may have access to the Copy From option.
You can save yourself time when completing your timesheet by copying data from another location.
To copy data to your timesheet:
The Overwrite With option will overwrite any existing information from the current timesheet.
Previous Timesheet Excluding Time Data
Copies the projects, tasks, activities, and row-associated custom fields from your previous timesheet
Previous Timesheet Including Time Data
Copies the projects, tasks, activities, row-associated custom fields, time entries, and any custom field data from your previous timesheet
If you are a shift worker, fills your timesheet with the hours you are scheduled to work
Your timesheet is now auto filled with the data from the option you selected. If you incorrectly fill your timesheet, you can clear the contents with the Clear All button.
Your company may not have the timesheet population methods enabled.