Prior Manual Bookings

We don't have the ability to make reservations through our website. Potential guests would call us and we would send them invoices through PayPal. After we received the payment, we would block our calendars on our website and everywhere else. How do we enter those bookings into OwnerRez? We want to make sure that we don't send payment requests to the guests that already paid for their stays this summer. I am probably making it more complicated than it is. 

You'll want to manually create the bookings in OwnerRez, manually enter all their appropriate Charges, and then, on the Transactions tab, record an offline payment for the amount already paid, to leave the correct remaining balance.