Pulling information from main script or function to constraint

I am interested in solving an optimization problem with MATLAB's gamultiobj function. I have built the function with the options I need. But each problem needs to have a different constraint, which I have saved externally.

I have a separate constraint function that I call. But I don't see how I can include this data in my constraint function. On the other hand I have also built an initial population, and I can use "options" as an input to the function, which gives me a way to pass the data being read in the main function to the population generation function.

How can I do this with the constraint function?

Example: minimize x = p*n

s.t. n * s > y

But for each problem I run, y is different. I have the y values in an external data file.