如何使输出的NC程序在B轴旋转之前，使主轴都先回到参考点

如何修改后处理或是其他什么地方能使得输出的程序满足要求，谢了
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O0000(T)
(DATE=DD-MM-YY - 14-04-08 TIME=HH:MM - 22:24)
(MCX FILE - E:\LIANXI\MasterCAM\T.MCX)
(NC FILE - E:\LIANXI\MASTERCAM\T.NC)
(MATERIAL - ALUMINUM INCH - 2024)
( T319 | 4"  FACE MILL | H319 )
G20
G0 G17 G40 G49 G80 G90
( 4 - AXIS HMC )
( MACHINE GROUP-1 GLW- 4 AXIS MILL (GROUP NAME) -GLW )
( GLW- 4 AXIS MILL (GROUP COMMENT) -GLW )
T319 M6
G0 G90 G54 X-8.4 Y.0001 B0. S1069 M3 改成先回参考点，在转到B0，然后G54 X－8.4 Y.001
G43 H319 Z3.1
G1 Z3. F1.07
X6.4
G3 Y2. R1.
G1 X-6.4
G2 Y3.9999 R1.
G1 X8.4
Z3.1
( 4 - AXIS HMC )
( MACHINE GROUP-1 GLW- 4 AXIS MILL (GROUP NAME) -GLW )
( GLW- 4 AXIS MILL (GROUP COMMENT) -GLW )
G55 X-7.4 Y.0001 Z4.1 B90. 改成先回参考点，在转到B90，然后G55 X－7.7 Y.001; 最后Z4.1
Z4.
X5.4
G3 Y2. R1.
G1 X-5.4
G2 Y3.9999 R1.
G1 X7.4
Z4.1
M5
G91 G0 G28 Z0.
G28 X0. Y0. B0.
M30
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