The Merseysiders routed Reich Insurance Blue 8-0 in what boss Mike Bloomberg branded as “the most complete performance” of his tenure.
Haroldeans – who are in MJSL title contention and the Shonn Trophy quarter-finals next month – will play Leeds Maccabi.
Their semi-final win never looked in doubt after Adam Shiffman fired a hat-trick. Max Green, Jack Bookey, Bobby Fishel and Adam Boyar salso netted to ensure it would be a smooth passage.
Haroldeans boss Bloomfield said: “In all my years involved with the club, this was one of the most complete performances. We were so dominant and ruthless in front of goal.