This article explains how to delete items from your timesheet.
Note
You can only delete timesheet times that have not been submitted or approved.
To delete a single timesheet item, locate the item in your timesheet, and click the Delete icon 
for that item.
To delete several timesheet items at once:
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Check the check box next to the timesheet items/rows you want to delete.
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Click Delete, and select Selected Rows.
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Click Yes to confirm the deletion.
In this example, the items "Define scope of project," and "Present Research Findings" will be removed.
To delete all empty rows in your timesheet, click Delete and select Empty Rows. Then click Yes to confirm the deletion.
In this example, the line item "Define scope of project" will be removed since there are no time entries for that item.