Sorry, I don’t understand the question well enough to give you an anser.
Can you give an example of what you want to do? For example, perhaps ten rows of data, including two or three computed columns (with the rules for computing those columns), and how the user might want to change the formulas used to compute those columns. It’s good to know you’re using Forms 6i, but its even more important to know which version of the Oracle DATABASE you’re using. For example, the MODEL clause may do exactly what you want, but it’s only available in Oracle 10 (and up).