Custom home position for laser cutting

I recently began a laser build using smoothie-ware and fusion 360 but I've hit a bit of a snag. I want to be able to start cutting anywhere in the build area but when I start the g code from fusion the machine will home against the end stops and begin working relative to the stock point set in fusion. If I had a odd shaped piece of material I need to set the program to begin at a certain point that I can manually move to. How do I get smoothie ware to begin where I place the machine rather than homing to the end stops?

... you can set and move to any "virtual 0-position" with G92 -- e.g. at 50,30,-20 (X,Y,Z) with: "G28; G92 X-50 Y-30 Z20; G0 X0 Y0 Z0 F3000"

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Viktor
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