Price elements are ROOM RATES, ADDITIONAL BEDS, DISCOUNTS, EXTRAS

For each combination of price element and age range TW creates a line in the reservation breakdown.

So if you have a double room (base=2pax) with 3 adults and 1 child you will have 

1. Double room (Adults) ----> price for 3 adults in double room
2. Double room (child) ----> price for 1 child in double room
3. Double room 1st add. bed (child) ----> discount/supplement for 1 child in additional bed
4. Double room 2nd add. bed (Adult) ----> discount/supplement for 1 adult in additional bed 

or if you have 1 adult and 2 children in the same double room: 

1. Double room (Adults) ----> price for 1 adult in double room
2. Double room (child) ----> price for 2 children in double room
3. Double room 1st add. bed (child) ----> discount/supplement for 1 child in additional bed 

The resulting list may look shorter as TW remove automatically the zero-priced room rates. 

"1st additional bed" means 1 bed in addition to the standard occupancy defined in the Rooms tab.

Based on general usage patterns here are few extra notes:

• children discounts should be negative (-10, -28) unless they are extra charges
• if you wish children to benefit of the discount only when they stay with 2 adults, move children discounts from the room row to the 1st add.bed and 2nd add.bed rows and then replace them with 0 in the room row:

  Room XYZ	98	0	0
  1st add bed	0	-10	-28
  2nd add bed	0	-10	-28