keep field constantly updated with values from another table even if it changes

crosscross Member Posts: 10
I am feeding a field with the sum of the quantities of another table, however, I need to know how to keep this field updated if the field of the table that feeds it changes its value? because after it is full and it changes, it does not update.

I still don't have code for this, I just want to know how to perform this procedure or in what way or option it is used.

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