Yes, it’s possible. You could setup security deposit as a percentage of the booking amount or as the room price times X nights or as a fixed amount. As a first step to setup security deposit make sure you have correctly setup payment processing system for your property in the “Settings” >“Manage Properties” > “edit property” button > “Payment Processing” tab. After you done with payment processing system go to the “Pricing Rules” tab of the property settings and in the “Rates”section you can find “Security Deposit” column.