Paul Hurley scored a try for Christians after just three minutes of the kick off and they held that lead up to half time.
Within minutes of the restart Presentation launched their first meaningful aattack and were denied a try but wound up with a penalty from Barry Keeshan. Four minutes later Keeshan added a second which was to prove decisive.
From that point until the final whistle Pres were forced to defen which they did with courage and tenacity to book their place in the final.
PBC: D Kingston; T Gleeson, M Murphy, M O'Gara, J Gleeson; B Keeshan, D Stringer; J Moynihan, R Quinn (Captain), N MacMahon, B Buckley, S O'Keeffe, J O'Flynn, H O'Flynn, R Geoghegan. Replacements: J Cronin for Moynihan 55 mins, R Nugent for Buckley 71 mins.
CBC: K Mitchell; P Hurley, C Kenny, J Harte, E Godesell; T O'Leary, D Williams; S Gallagher, D Blower, D Hurley, R Noonan, K Leonard, B Holland, M Essex, L Quaid (captain). Replacement: D. Cronin for Hurley 50 mins.
Referee: D Maloney (Munster).