If you have multiple rate codes at a channel, you can map different Daily Prices to each by entering the rate code in each of the Daily Price settings.

Make sure to create additional daily price or rates

Set "Number of Daily Prices " to the number you need. Please go to :Settings  >  Properties  > Rooms  > Daily Prices

If you are using "rates", you can add new rates from "rates" tab

Each daily price can be used for any combination of channels and your booking page. Use the tick boxes at SETTINGS-> PROPERTIES-> ROOMS> DAILY PRICES to specify which channels the price can be used for.

Create multiple rates and connect multiple rate codes at a channel.