Is there a way to fix an order on executing a script with multiple sections ?

Hi

I have a script with multiple sections and I was wondering if there was a way to fix an order of executing the sections. For example :

Section 1, 2 and 3 ==> sometimes I want section 2 to be executed before 1 or 3 before 1 or any other order.

Thanks in advance, and please accept my apologies if there's a trivial way because I am not an expert.

[anis oukil]

I want to Add that the sections are independant.

[anis oukil]

And that there's way more than 3 sections, that's why I can't execute one by one.