Limiting the number of nights for discounts

Q. How can I limit a special discount rate: e.g. use the Good Sam discount for a maximum of 6 nights.

A: I'm assuming you mean that it should only apply for the first 6 nights.  You can do this by setting the # days in the "Applies for a maximum" setting in the Rate Definition.

https://campgroundmaster.com/help/rate-multipliers-and-filtering.html

Note however that if they stay more than a week, then it could still apply it to the "Extra" days if you have a Weekly rate as well -- e.g. for a 12-day stay it could apply the Weekly rate, and then use the Good Sam daily rate for the other 5 days.

If that's not what you want and it should only apply if their TOTAL stay is 6 days or less, then you need to use the "Applies if <=" setting as well (e.g. Applies if <= 6 days).