Go to Student life → Boarding → Houses and open the Structure tab. Build it from the top down:
- 1New house — name, colour, capacity, motto and house master.
- 2New dormitory — name, capacity, gender and level.
- 3Add rooms — you can enter one room name per line to add several at once.
- 4Add beds — give a label, or a starting label and how many, and the number of tiers.