How could I mix those 2 codes? [School Project]

Question

I have been working on a School Project with Pygame. I have already created the menu and the first levels from each module (the infinites levels). In the following codes there is a simplified version of the menu (only the sums module works) and the first level of the sums. What should I do to be able to merge them? I have tried to create a single function for the Sum1 code, but does not work.
{I add the imported InputBox just in case}

https://code.sololearn.com/ctgIUbjnuLrY/?ref=app
https://code.sololearn.com/c84aCoEYuKAb/?ref=app
https://code.sololearn.com/cZC2outAgb3N/?ref=app

Answer 1

For example, the Sum1 code should appear after pressing the Infinite Sums level, but here lies the problem.

pygame_menu explanation: https://pygame-menu.readthedocs.io/en/4.1.3/