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.
“The attitude and commitment of the players was first-class. They fully deserve their place in the final win in what will be a tough examination against Leeds.”
Leeds had to work somewhat harder in their last-four tie with Maccabi Manchester Yellow, after surviving a second half fightback to squeeze through 3-2.
Louie Hewson’s brace and Alistair Landy had Leeds cruising before the home side responded via Rafi Dines and Aaron Englander.
But Leeds clung on and boss Adam Kristall said: “It’s a great achievement for us to be in the final.
"We want to end the season with silverware and this gives us the opportunity to do so.”