Not completely sure what you are asking.
In machinist you create a toolpath file - G-Code. In V-carve you import that toolpath file. It really has nothing to do with Machinist at that point. It is only the resultant toolpath file that machinist created.
With that is mind, you can create as many toolpath files from machinist as you want and import into V-Carve.
Something I used to do was to create a Rough toolpath file to leave - say - .050 material. THEN- I would create a finish toolpath file with a coarse stepover, and I would set my tool about .01 higher than my Z zero - kinda like a semi-finish tool path. Last I would create a finish toolpath with a fine stepover - call that my "finish" tool path. I would set my cutter at Z zero.
You can import many toolpaths, even from different models.
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