Enter content that only goes to channels in Settings > Channel Manager > Property Content and Room Content. Beds24 sends it to the channels that accept content data from Beds24.
The channel's help page explains which content it takes. For Airbnb, Booking.com, Vrbo and Hometogo, see Content for Airbnb, Content for Booking.com, Specific property content for VRBO and Specific property content for Hometogo.