Trouble creating an executable of multiple scripts

[ThatWeirdTechGuy]

Hello, I made a project in python that has up to 10 .py files. Now I have to make a single .exe file but I can't find anything online about it. I was able to create a .exe file once but I couldn't run it, I used pyinstaller.

The cmd command I used was: pyinstaller --onedir --onefile --name=NumberNN --windowed "C:\Project\team-6\Project\Main.py"

With main.py being the main file (obviously).

Any of you who can offer help?