You do the reservation list all 3 times as follows.
No.1 Date 16 Feb 2015 order no. REN04544 type standard twin fan room check in 20.12.15 and check out 26.12.15 (include extra bed, breakfast, boat ticket no. 2015/49, 2015/50, 2015/51)
No.2 Date 13 June 2015 order no. REN05096 type standard twin fan room check in 19.12.15 and check out 20.12.15 (include breakfast). When you check in you can paid for extra bed.
No.3 Date 13 June 2015 order no. REN05097 type standard twin fan room check in 25.12.15 and check out 26.12.15 (include breakfast). I’m not sure because If you make a duplicate (No.1). I will refund for this item (order no.REN05097)