Help with programming

Its stabbing in the dark without seeing what you do, but I guess you would have to turn every calculation, which uses the parameters you would like to vary at the end, into functions dependent on those parameters.

With long winded calculations as you describe it this can be pretty cumbersome and result in a wild looking worksheet.

It has bee a long standing wish of the community to be able to turn a whole worksheet into a function of a number of selectable arguments but as development is running now, that kind of wishes never will be fulfilled.

While I don't like the approach - Raikos way to start with vectors of input values right from the start, vectorize the calculations to end up with a vector of result values should work with long winded calculations as well (and possibly will look cleaner compared to the suggested functional approach). Where do you see a problem with that?
Guess it would help if you post a worksheet to show what exactly you are trying to attempt (a simplified one showing only the important things would be preferred).

BTW, as you obviously could read Raikos MC15 worksheet, you seem to have MC15 installed along with Prime 2. Why do you bother to use Prime 2 when MC15 is at your hand?