When is it useful to add the code in a thesis?

I am writing my master of science thesis and I am not sure if it is the case of adding some of the codes I have written: they are not proper code, but more like input files to be fed to a commercial program (Nastran) very popular in my field.

My concerns are related to the fact that I am not making any discovery, just apllying the things I have learned reading the manual. Still I feel the codes will make more clear the effort I put in the thesis to learn also this language.