Rates entry for 7th day free

Q: If someone stays for six days and the seven day is free, how do I show a free day?

This would generally be the same thing as a weekly rate -- set up a rate that's "per 7 days", and make the charge be the total amount for 6 days.  If you're using auto-rates, make sure this rate is *above* the daily rate in the list, so if they stay 7 days it will use this 7-day rate instead of 7 daily rates.

For a step-by-step example of weekly rates, see the Rates Setup Examples in the documentation.