Gcode - set axis offset function

[GadiHasson]

Hi everyone,
I'm working with SINUMERIK 808D control for sharpening machine,
when I clean the stone I have to re-offset the Z axis.
I want to know if there is a G function that let me set a new offset inside the gcode?

thank alot.
Gadi

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[GadiHasson]

Hi guys.
I found something that can help me with this operation, may be helpful for someone.
https://www.cnccookbook.com/g10-g-co...achining-haas/

still don't understand the function parameters:
G291
G91 G10 L_ H_ P_ R_
G290

what L, H, P, R means?