Custom fields through macros

Is it possible to (a) define custom fields for samples and (b) set the values for each sample in a given sequence through macros?  As in the same way one sets the values in the _SEQUENCE[1], "SeqTable1" for example?  I was not able to find whether these were stored in a register or not - neither was I able to see where they were stored through logging.

 

Chemstation C.01.07 SR2

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