You can write offsets using the G10 command; have a look in the Haas manual.
G10 L12 G90 P1 R.5 will write the absolut value of 0.5 in to the tool comp table for tool 1.
G10 L2 G90 P1 X-5. Y-4. Z-6. will write -5. for the X coordinate, -4. for the Y coordinate and -6. for the Z coordinate into the G54 line for the work offset table.
As I suggest read the manual, it is a bit fuzzy at first but gradually gets clear.
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