Two narrow victories settled the finalists in the Hertfordshire 1961 Sunday Football League's Jim Lynch Trophy.
The narrowest of them saw penalties needed as Phoenix and Strafford Arms failed to find the back of the net in normal time.
Arms advanced 3-2 in the shoot-out though.
They will now play Borehamwood Rovers who beat Six Bells 2-1 in the other semi-final.
Jack Allen had got the first for Rovers but it needed a 90th minute winner from Flo Bojaj to send them through.
Fresh from their county cup triumph last week, BWSC qualified for another final as they beat Little Heath in the Herts 1961 Challenge Cup.
Jake McIntosh got two in the 4-2 success with Billy Garvey and Michael White getting the others. Jonathon Rutnam and Tino Madziya scored for Little Heath.
They will play Strafford Arms in the final.
Harpenden Colts OB moved second in group C of the Charity Cup with their biggest win of the season, beating Marshalswick Rovers 8-1.
A Tom Stagg hat-trick and a brace from Louis Enajedu accounted for five of them with Dan Bradley, Oliver Lacey and Lawrence Waldram also on target. Chris Shepherd got the Marshalswick reply.
Hatfield Comets caused a surprise thanks to a 2-1 win over Hopfields in group D. Josh Blackburn and Zlatko Murphy with their goals, George Wallis scoring for Hopfields.
Hopfields or Phoenix Res will still finish second though, depending on the result of the last group game on Sunday.
Stotfold Rovers confirmed top spot in group B with a 1-1 draw with Crown, Louis Baker-Madec scoring for the latter.
In Division Two, Saints now lead the pack after a 3-2 win over Royston Rangers.
Harry Floyd, Lewis Cocomazzi and Cillian Webb scored for them to give them a one point advantage over Alban Dynamo with a game in hand.
Royston’s replies came from William Ayriss and Sam Haldane.
AFC Boots brought their league programme to an end with a 3-2 win over Mermaid Res. Oliver Whitehouse got two and Josh Dooley one.
Leverstock Green CC pulled off a surprise by handing Division Three leaders Hertfordshire Vets their third loss of the year.
The 3-1 success came courtesy of goals from Kieran Shepherd (two) and Adam Sawyer, Lewis Bulled with the consolation for the Vets.
For the second time this season Welwyn Warriors Res defeated Brookmans Park Res by the same score, 3-0.
Their goals came from Liam Cosgrave and a brace by Max MacKenzie.
Ben Hobden got two as London Colney Utd picked up a 4-1 win against Little Heath Res in Division Four. Bailey Calas, and Alesandro Fardella got the others while Harrison Corr scored for Heath.
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