As there are insufficient entries for complete rounds team A which has entered a tournament has been granted a bye in the first round. Their opponents in the second round are playing in the first round. Due to bad feeling developing between the players of team A they decide after the tournament has started that they are not going to play in the tournament after all.
May one of this team act as a substitute in subsequent rounds?
No. An intended team receiving a bye in the first round shall be a constituted team. A constituted player is ineligible to act as a substitute in any other team in the same competition. DR 2.2.4 & DR 2.2.9
In a competition in which there are two or more rounds in the one day, a team has a bye in the first round. The team that they are drawn to play has played in the first round.
Can the team that has the bye practice prior to the second round?
Yes, as long as the Controlling Body approves and that there is sufficient time available without delaying the competition, and a rink is available other than the one upon which the team has been drawn in a subsequent round. Laws 4.1