See Crunch Automation basics for more information.
The ADD CATEGORIES command allows you to add extra empty categories to categorical variables. The new categries must have a code and a label that does not currently exist in that variable. All the variables mentioned must have the same categories.
ADD CATEGORIES ON alias, ..., alias LABEL "string" CODE code [MISSING], ... LABEL "string" CODE code [MISSING];
ADD CATEGORIES ON awareness, product_awareness LABEL "Not Asked" CODE 8 MISSING, LABEL "Not Answered" CODE 9 MISSING;