Make keyboard shortcut for a piece of code.

Hi I am editing a lot of subfunction which are located in different .m files than the one (main.m) they are called from. This means that I need to change the window tap to run the code and back again when I want to edit the code of the subfunction.

In order to not do this I would like to hit a a keyboard shortcut that runs a certain piece of code that runs the main file even though I am looking at another file in the following way:

hit the shortcut "F9" --> execute the code "run('main')

Thanks in advance :)