Hi pch, yes this is very simple. Go to your Property Setup ==> Rates tab. At the top is a drop-list labeled "Weekly/Monthly Rates Policy:". It defaults to "Fall-Back", in which extra days simply "fall-back" to the standard rates (as entered by you).
Select "Pro-Rated" instead, and it will price additional days based on the average weekly rate.
Make sense? As always, let us know if we can help.
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