-Follow the steps 1-4 which you can see in the picture here
1. Enter the name of the room type, it should give clear and understandable information about the room to your guests
2. Select "Include Only Selected" to choose the rooms that correspond to your room type
3. Mark the boxes of the rooms that your room type reflects, for example mark the booxes of Room 1 nd 2 which are 4 Bed Mixed Dorms with the Type "4 Bed Mixed Dorm"
4. Click Save
Create as many Room types as you need.