I use #define constant in SELECT statement and as character string like:

CREATE CURSOR invoice ( price N(12,2), quantity N(2), packing N(2))
#define d_quantity quantity*packing
#define d_sum price*d_quantity

SELECT d_sum FROM invoice

TEXT TO ctxt noshow
  d_sum
  ENDTEXT
MESSAGEBOX('Sum formula is: '+ctxt)

This requires separate memory variable using TEXT command for each #define

How to force MESSAGEBOX() to show d_sum value as character string without using TEXT command?