United's 3-2 area final victory over Huddersfield Town last month took them to St George's Park for the national cup final meeting with Bournemouth.
The Blues went with a relatively young side - a mix of first-year professionals and under-18 players - but there was a first appearance for Morgan Feeney, with Gime Toure also part of the 4-4-1-1 formation.
It was a windy, blustery afternoon and United kicked off with the strong gusts at their backs.
Carlisle started brightly, and Walton almost picked a path for Fishburn after he latched on to good work from Toure. The pass was cut out and instantly cleared.
Pace from Gillele took him through and into the United box as he angled a run from the left. His pull back found Anthony, but a drilled close-range effort was tipped onto the superbly by Breeze.
It was a short-lived reprieve though as Greenwood made inroads on the right flank. A low cross was controlled by Saydee and his second touch left the keeper with no chance.
The lively Nippard had an effort blocked as he exchanged passes on his way into the area, and the wide man was clean through as another neat move left him with just Breeze to beat. The Cumbrian stopper stayed big to make another fine save.
Carlisle went close to levelling things up when Toure beat his man before heading for the angle of the area. His curled shot was going in until Dennis threw out a hand to beat it away.
But it was Bournemouth who celebrated again when Genesini found Anthony with an unbelievable through ball. The striker kept his calm as he picked his spot.
United passed their way through a packed defence to set Walton free as they looked to make an impact, and his clipped cross had Fishburn interested. He jumped but he couldn't quite make the connection. Toure recycled it but his attempt was blocked as he tried to get past his man.
First-year keeper Gabriel Breeze was in fine form and he executed another much-needed save with his boot as Nippard beat the offside trap.
Into the second half and a good touch from Lightfoot in the Bournemouth half allowed him to bring Walton into the equation, and his cross caught the wind. Dennis called for it and plucked it out of the air.
Kilkenny sent a speculative punt over the bar as the Cherries probed, and Nippard had one charged down at source when he tried to find a gap.
Jack Ellis came on at right back, with Charlie Barnes stepping into the central defensive role as Morgan Feeney completed his hour, but there was a real scare for the new look back line when Anthony played Kilkenny into space. A rasping effort smashed onto the post and Barnes helped it on its way.
Carlisle were close at the other end when Ellis rifled a volley through bodies. Dennis parried, and the keeper reacted quickly to tip the follow up header from Fishburrn over the target.
Bournemouth were close again when Nippard stepped inside a challenge before letting one fly. Breeze watched in relief as it bent past the upright.
Back at the other end and Walton got wide to make space for a pass. He found Toure, but the forward couldn't keep his first time effort down.
Keeper Gabriel Breeze made another superb block as Anthony bore down on goal. He spread himself to both smother and grasp the ball as a rocket came at him.
United kept asking questions and a cross from Birch was recovered by Swailes at the back stick. Fishburn tried to volley on the turn but it lacked conviction and Dennis comfortably scooped it up.
Bournemouth captain Gillele was thwarted by a diving save from Breeze late in the day. He got on the end of a Nippard cross, at close range, but the big keeper threw himself across the line to get his hands to the bouncing ball.
That was the last action of the final with the Cherries taking the silverware courtesy of their first half goals.
Bournemouth - Saydee (12), Anthony (25)
Bournemouth - 1 Dennis, 2 Genesini, 3 Gillele (c), 4 Greenwood, 5 Zemura, 6 Kilkenny, 7 Nippard, 8 O'Connell, 9 Glover, 10 Anthony, Saydee (Jordan 41). Subs - Price, Burgess, Hunt, Adams.
Carlisle United - Breeze, Barnes, Wilson, Feeney (Ellis 60), Leslie, Walton (Swailes 73), Lightfoot (Rooks 84), Dixon, Birch, Toure, Fishburn. Subs - Simons.
Referee - Richard Eley
Assistant - Minesh Guopta
Assistant - Daniel Clenton
Fourth official - Andy Wood