V MILL puzzle

OK so I have:

a g-code file:
N100243 X5.5 Y2.2 Z3.3
250,000 lines (not generated in a CAD CAM)

It is the of the final contour and to do plunge routing to get rid of a lot of material.

So, how do I keep the offset from the final product??
Can I load the g-code file and define a new path??
Please help this novice..............


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