后处理如何在下刀后“W3” 抬刀前增加“W0”?

下面是我们的激光切割机的程序，我用UG写一后处理只能实现在“G0”运动前一行增加“W0”。却始终无法实现在下刀之后切割之前增加一行“W3”其中的“W0”为关闭激光“W3”为打开激光。实际加工应该在“G0”移动前关闭激光以便与快进，在下刀到工件表面接触后再打开激光进行切割。不知道“W3”这个功能在post_buiider里面怎么实现，我考虑应该写一变量调用“Z×× F××”移动后换行增加“W3”可我不会写变量。 不知道我的思路对不对，或者应该采用另外的什么方法来实现这个功能。
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O1000
S08
M61
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Z-250.
G1 Z-300.
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X-46.828 Y258.437
X-46.609 Y257.686
X-46.31 Y256.963
X-45.933 Y256.277
X-45.48 Y255.634
X-44.956 Y255.044
X-44.366 Y254.52
X-43.723 Y254.067
X-43.037 Y253.69
X-42.314 Y253.391
X-41.563 Y253.172
X-40.788 Y253.037
X-40. Y252.99
X-39.212 Y253.037
X-38.438 Y253.172
X-37.686 Y253.391
X-36.963 Y253.69
X-36.277 Y254.067
X-35.635 Y254.519
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X-33.69 Y256.961
X-33.391 Y257.683
X-33.171 Y258.436
X-33.036 Y259.211
X-32.99 Y260.
X-33.037 Y260.789
X-33.172 Y261.564
X-33.391 Y262.316
X-33.69 Y263.039
X-34.068 Y263.725
X-34.52 Y264.368
X-35.045 Y264.957
X-35.635 Y265.481
X-36.277 Y265.933
X-36.963 Y266.31
X-37.686 Y266.609
X-38.438 Y266.828
X-39.212 Y266.964
X-40. Y267.01
X-40.788 Y266.963
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X-43.723 Y265.933
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X-45.933 Y263.723
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X-46.828 Y261.563
X-46.963 Y260.788
X-47.01 Y260.
W0
G0 Z-250.
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G1 Z-300.
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X-26.828 Y313.437
X-26.609 Y312.686
X-26.31 Y311.963
X-25.933 Y311.277
X-25.48 Y310.634
X-24.956 Y310.044
X-24.366 Y309.52
X-23.723 Y309.067
X-23.037 Y308.69
X-22.314 Y308.391
X-21.563 Y308.172
X-20.788 Y308.037
X-20. Y307.99
X-19.212 Y308.037
X-18.438 Y308.172
X-17.686 Y308.391
X-16.963 Y308.69
X-16.277 Y309.067
X-15.635 Y309.519
X-15.045 Y310.043
X-14.52 Y310.632
X-14.068 Y311.275
X-13.69 Y311.961
X-13.391 Y312.683
X-13.171 Y313.436
X-13.036 Y314.211
X-12.99 Y315.
X-13.037 Y315.789
X-13.172 Y316.564
X-13.391 Y317.316
X-13.69 Y318.039
X-14.068 Y318.725
X-14.52 Y319.368
X-15.045 Y319.957
X-15.635 Y320.481
X-16.277 Y320.933
X-16.963 Y321.31
X-17.686 Y321.609
X-18.438 Y321.828
X-19.212 Y321.964
X-20. Y322.01
X-20.788 Y321.963
X-21.563 Y321.828
X-22.314 Y321.609
X-23.037 Y321.31
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X-25.48 Y319.366
X-25.933 Y318.723
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X-26.828 Y316.563
X-26.963 Y315.788
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W0
G0 Z-250.
Y345.
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X-26.828 Y343.437
X-26.609 Y342.686
X-26.31 Y341.963
X-25.933 Y341.277
X-25.48 Y340.634
X-24.956 Y340.044
X-24.366 Y339.52
X-23.723 Y339.067
X-23.037 Y338.69
X-22.314 Y338.391
X-21.563 Y338.172
X-20.788 Y338.037
X-20. Y337.99
X-19.212 Y338.037
X-18.438 Y338.172
X-17.686 Y338.391
X-16.963 Y338.69
X-16.277 Y339.067
X-15.635 Y339.519
X-15.045 Y340.043
X-14.52 Y340.632
X-14.068 Y341.275
X-13.69 Y341.961
X-13.391 Y342.683
X-13.171 Y343.436
X-13.036 Y344.211
X-12.99 Y345.
X-13.037 Y345.789
X-13.172 Y346.564
X-13.391 Y347.316
X-13.69 Y348.039
X-14.068 Y348.725
X-14.52 Y349.368
X-15.045 Y349.957
X-15.635 Y350.481
X-16.277 Y350.933
X-16.963 Y351.31
X-17.686 Y351.609
X-18.438 Y351.828
X-19.212 Y351.964
X-20. Y352.01
X-20.788 Y351.963
X-21.563 Y351.828
X-22.314 Y351.609
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X-23.723 Y350.933
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X-25.48 Y349.366
X-25.933 Y348.723
X-26.31 Y348.037
X-26.609 Y347.314
X-26.828 Y346.563
X-26.963 Y345.788
X-27.01 Y345.
W0
G0 Z-250.
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G1 Z-300.
W3
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X-26.828 Y393.437
X-26.609 Y392.686
X-26.31 Y391.963
X-25.933 Y391.277
X-25.48 Y390.634
X-24.956 Y390.044
X-24.366 Y389.52
X-23.723 Y389.067
X-23.037 Y388.69
X-22.314 Y388.391
X-21.563 Y388.172
X-20.788 Y388.037
X-20. Y387.99
X-19.212 Y388.037
X-18.438 Y388.172
X-17.686 Y388.391
X-16.963 Y388.69
X-16.277 Y389.067
X-15.635 Y389.519
X-15.045 Y390.043
X-14.52 Y390.632
X-14.068 Y391.275
X-13.69 Y391.961
X-13.391 Y392.683
X-13.171 Y393.436
X-13.036 Y394.211
X-12.99 Y395.
X-13.037 Y395.789
X-13.172 Y396.564
X-13.391 Y397.316
X-13.69 Y398.039
X-14.068 Y398.725
X-14.52 Y399.368
X-15.045 Y399.957
X-15.635 Y400.481
X-16.277 Y400.933
X-16.963 Y401.31
X-17.686 Y401.609
X-18.438 Y401.828
X-19.212 Y401.964
X-20. Y402.01
X-20.788 Y401.963
X-21.563 Y401.828
X-22.314 Y401.609
X-23.037 Y401.31
X-23.723 Y400.933
X-24.366 Y400.48
X-24.956 Y399.956
X-25.48 Y399.366
X-25.933 Y398.723
X-26.31 Y398.037
X-26.609 Y397.314
X-26.828 Y396.563
X-26.963 Y395.788
X-27.01 Y395.
W0
G0 Z-250.
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G1 Z-300.
W3
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X-26.828 Y418.437
X-26.609 Y417.686
X-26.31 Y416.963
X-25.933 Y416.277
X-25.48 Y415.634
X-24.956 Y415.044
X-24.366 Y414.52
X-23.723 Y414.067
X-23.037 Y413.69
X-22.314 Y413.391
X-21.563 Y413.172
X-20.788 Y413.037
X-20. Y412.99
X-19.212 Y413.037
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X-17.686 Y413.391
X-16.963 Y413.69
X-16.277 Y414.067
X-15.635 Y414.519
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X-14.52 Y415.632
X-14.068 Y416.275
X-13.69 Y416.961
X-13.391 Y417.683
X-13.171 Y418.436
X-13.036 Y419.211
X-12.99 Y420.
X-13.037 Y420.789
X-13.172 Y421.564
X-13.391 Y422.316
X-13.69 Y423.039
X-14.068 Y423.725
X-14.52 Y424.368
X-15.045 Y424.957
X-15.635 Y425.481
X-16.277 Y425.933
X-16.963 Y426.31
X-17.686 Y426.609
X-18.438 Y426.828
X-19.212 Y426.964
X-20. Y427.01
X-20.788 Y426.963
X-21.563 Y426.828
X-22.314 Y426.609
X-23.037 Y426.31
X-23.723 Y425.933
X-24.366 Y425.48
X-24.956 Y424.956
X-25.48 Y424.366
X-25.933 Y423.723
X-26.31 Y423.037
X-26.609 Y422.314
X-26.828 Y421.563
X-26.963 Y420.788
X-27.01 Y420.
W0
G0 Z-250.
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G1 Z-300.
W3
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X-26.828 Y468.437
X-26.609 Y467.686
X-26.31 Y466.963
X-25.933 Y466.277
X-25.48 Y465.634
X-24.956 Y465.044
X-24.366 Y464.52
X-23.723 Y464.067
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X-16.963 Y463.69
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X-13.69 Y466.961
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X-13.391 Y582.316
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G0 Z-250.
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X-71.963 Y614.212
X-71.828 Y613.437
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X-71.609 Y617.314
X-71.828 Y616.563
X-71.963 Y615.788
X-72.01 Y615.
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