If you offer meals you can set these in SETTINGS-CHANNEL MANAGER-BOOKING.COM-SPECIFIC PROPERTY CONTENT in "Custom".
1. Types of breakfast available
CO = Continental IT = Italian EN =/Full english VE = Vegetarian VG = Vegan HA = Halal GF = Gluten free KO = Kosher AS = Asian
BREAKFASTTYPES CONTINENTAL ASIAN
In this example Booking.com will show that you offer Continental and Asian breakfast.
2. Meal prices
In this example guests will be able to book breaffast for the price of 10 at Booking.com.