Once your invoice is ready to be created, and you notice that certain items that need to be removed.
To remove a time entry, navigate to either your Calendar or Time Entries page. Filter for the necessary entry, and open the entry. Within you'll find a "Delete" button (Calendar) or a trash can icon (Time Entries).
To remove an expense, navigate to the Expense page, and filter to find the necessary item. Open the expense, and select "Delete" to remove the item.
To remove a Fixed Fee, navigate to the Matter's settings, and open the Fixed Fee tab. Click the necessary fee item, and the select the "Delete" button at the bottom to remove.