how to add multiple functions in a single Simulink MATLAB function file?

here i have generated seperate .m function files, all function files called many times in script code and it works fine..

Now,

I need to make simulink block using MATLAB Function block, which upon giving inputs should generate output by solving multiple functions in one block (like script having many function and run smoothly to give solution)..

How to make this in simulink,

Help is appreciated.