Entering credit card information without a payment

Q: How do I record a customer's credit card details without actually entering a Payment transaction (we get this information when they make a reservation in case we need to charge a cancellation fee).

A: This is what the "Guarantee" function is used for in Campground Master.  When you Guarantee a reservation, it will show an entry dialog for all of the credit card information (and other notes if necessary).  If you don't actually do the Guarantee step, you can also enter this information through Reservation Details -- click on the small "..." button at the end of the Guarantee Info field to get the individual credit card entry fields.