If you post a partial PGN game, you have to include a FEN tag that has the current position. Otherwise the moves will have no meaning:
Example:
[Event "TCh-CHN 2012"]
[Site "Taizhou CHN"]
[Date "2012.06.29"]
[Round "7"]
[White "Zhai Mo"]
[Black "Guo Qi"]
[Result "1-0"]
[WhiteElo "2262"]
[BlackElo "2351"]
[WhiteTitle "WFM"]
[BlackTitle "WGM"]
[ECO "B19"]
[Opening "Caro-Kann"]
[Variation "classical, Spassky variation"]
[WhiteTeam "Hebei"]
[BlackTeam "Jiangsu"]
[WhiteFideId "8600201"]
[BlackFideId "8604002"]
[EventDate "2012.04.28"]
[FEN "2r2rk1/pp1n1pp1/1q3b1p/2pp2PP/2P5/Q4N2/PP1B1P2/1K1R3R b - - 0 20 "]
20...hxg5 21. h6 g4 22. hxg7 Bxg7 23. cxd5 Qa6 24. Qxa6 bxa6 25. Nh4 Rb8 26. Bc1 f5 27. Rde1 c4 28. Ng6 Rf6 29. Ne7+ Kf8 30. Ng6+ Kg8 31. Ne7+ Kf8 32. Nc6 Rb5 33. Bg5 c3 34. b3 Rxd5 35. Bxf6 Nxf6 36. Ne7 Rc5 37. Ng6+ Kf7 38. Ne5+ Kg8 39. Nd3 Rd5 40. Ne5 Rc5 41. Nd3 Rd5 42. Kc2 Ne4 43. Re2 Ng5 44. Nf4 Ra5 45. a4 Nf3 46. Re8+ Kf7 47. Ra8 Nd4+ 48. Kxc3 Nc6+ 49. Kd2 Kf6 50. Nh5+ Kg6 51. Rg8 Rd5+ 52. Ke3 Re5+ 53. Kf4 Re4+ 54. Kg3 Re7 55. Rxg7+ Rxg7 56. Nxg7 Kxg7 57. Rc1 Nd4 58. Rc7+ Kg6 59. Rxa7 Kg5 60. Rxa6 f4+ 61. Kg2 f3+ 62. Kf1 Nxb3 63. Ra8 Nd2+ 64. Kg1 Ne4 65. a5 g3 66. fxg3 Kg4 67. a6 Kxg3 68. Rg8+ 1-0
Post a PGN-file from the middle of the game

I would like to post a PGN-file starting from the middle of the game.
I delete the content from move 1- 25 and only paste from move 25 and forward.But then the diagram still starts from the beginning and it looks strange when i move next move.
If i paste the whole game i can´t seem to delete the beginning but only from the end in the game editor.