Coleraine rowers Alan Campbell, Richard and Peter Chambers and Joel Cassells have progressed from Friday's heats at the second World Cup in Lucerne.
The event is the final regatta before the Great Britain squad for the Rio Olympics is announced on 9 June.
The semi-finals will take place on Saturday, with the finals on Sunday.
Campbell won his single sculls heat comfortably and then was second fastest of the quarter-finalists in winning in a time of 6:53.43.
Richard Chambers and Will Fletcher were making their season's debut in the lightweight double sculls, with the London 2012 silver medallist now fully recovered from a hand injury.
The duo found themselves in a battle with Norway and USA through the 1500m mark, but with Austria a long way behind and three boats to progress to Saturday's semi-finals, Chambers and Fletcher eased off in the closing stages with the former world champions from Norway, Kristoffer Brun and Are Strandli racing to the line first ahead of the USA.
Richard's younger brother Peter and his team-mates, Mark Aldred, Jonno Clegg and Chris Bartley, in the lightweight four finished second in a high-class heat to move directly into Sunday's final.
Four seconds separated the top four crews with Great Britain only overtaken by world silver medallists Denmark in the closing stages while at the same time holding off the fast finishing French and Dutch boats.
World and European champions in the lightweight pair, Cassells and Sam Scrimgeour, continued their dominance of the non-Olympic class event by reaching Saturday's final after leading from start to finish and holding off Italy by just over two seconds on the line.