Booking.com can set up multiple rate ids for each room, each with pre-defined booking conditions. Beds24 can map a different Beds24 rate or offer to each Booking.com rate id.
If you do not have the appropriate rate ids you need to request Booking.com to add them. Once you have them you can set corresponding rates in Beds24 and map them to these codes.
*Click on the "Get the Booking.com Room and Rate Codes for this Property Code" link to view all mapping codes for this property.