I guess I read this differently than everyone else, as I understand it you want to input the vendor bill, and verify the total amount, per day, per period
create a non inventory item, name it, and select the expense account you usually use for his bills. set the rate to his hourly rate.
when you enter the bill, use the item details part of the bill and use that item, enter the hours as the qty and the total amount will calculate
you can use that same item on each line for a different day/date