Question About Functions

Hallo,

I'm really new at program. I have a question about function

I have a my main where i call the function menu() the function menu calls function like Button1, Button2 and Button3.

For example button1 itself call functions Like "Move FIile A to B" in this function Move File A To B i call a function "Prepeare directory" and so on.

Is this a good way to programm? Or is it better to call function successively in the right order at my main?

Thanks to all