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GRBL doesn't support O-codes (subprograms) so it's not a surprise that M98 is unsupported. You'll need to make your G-Code to do the operations inline.
Thanks a lot. Could you please tell me how to repeat the whole program up to a certain time (Example: 40 t
imes) with GRBL command?
Well, if you are writing G-Code by hand you just write the operations 40 times. If you are using CAM then it depends on what you are using. Also, you will need to select a GRBL post processor.
 

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Yes.

But, are you actually coding by hand? You should really be using CAD and CAM. Coding by hand for anything but ultra simple things is going to get old very very fast.

And, just looking briefly at your G-Code, I suspect you are missing some key points like for the Z axis, down/lower is usually negative. And M5 is a better way to turn off your spindle than M3S0. Have you watched any tutorials?
 

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Ah, that makes more sense. Though to be honest, your use is pretty far from what we normally see 'round these here parts, pardner. What is this for? Some sort of chess machine?
 
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