How to return to the start of a program/ a specific point of a program

Hi, first of all, I apologise for anything wrong, a newbie around the corner. I had just started programming a few days ago so I wanted to try some programming to digest further.

I was wondering if I could return myself to the start of the program or a specific point of a program. So, I asked a question somewhere else and a solution the contributor came up with was class (I haven't go through that section prior to this). I looked up here (my primary source) and..couldn't understand much about it..

This is the code provided by contributor

Code:

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int main()
{
      MyClass* class = 0;
      do{
            class = new MyClass();
            delete class; //important
            //ask user to repeat
          } while (userChoice == 'y');
       
      return 0;
}

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Code:

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#include <iostream>  //to let the compiler to see the cout
#include <cstdlib>  //to let the compiler to see the rand()
#include <ctime>    //to let the compiler to see the srand()


using namespace std;


int main()
{
    cout << "Hello! To the future Businessmen/women! This is just a mock program for you to  check your business skills \n\n";
    cin.ignore();


    cout << "Now, your shop has 3 items that are going to be sold and those are...\n";
    cout << "1. USB (4.0 GB)" << "\n" << "2. Headphone (Stars)" << "\n" << "3. Logitech Optical Mouse \n";
    cin.ignore();


    cout << "And you have a capital of RM 5000" << "\n\n";
    cin.ignore();


    int USB, Headphone, Mouse;
    float Capital, Price_USB, Price_Headphone, Price_Mouse, Cost_USB, Cost_Headphone, Cost_Mouse;


    Capital = 5000.00;
    Price_USB = 20.00;
    Price_Headphone = 12.50;
    Price_Mouse = 15.00;


    cout << "So, before we begin our operations, may I ask how much stocks have you ordered  for each items for this week?" << "\n\n";
    cin.ignore();


    cout << "For USB (4.0 GB) [The cost for 1 USB (4.0 GB) is RM " << Price_USB << " ] ? ";
    cin >> USB;
    Cost_USB = (USB)*(Price_USB);


    cout << "\n\n";
    cout << "For Headphone (Stars) [The cost for 1 Headphone (Stars) is RM " << Price_Headphone << " ] ? ";
    cin >> Headphone;
    Cost_Headphone = (Headphone)*(Price_Headphone) ;


    cout << "\n\n";
    cout << "For Logitech Optical Mouse [The cost for 1 Logitech Optical Mouse is RM " << Price_Mouse << " ] ?  ";
    cin >> Mouse;
    Cost_Mouse = (Mouse)*(Price_Mouse);


    cout << "\n\n";
    cout << "So, the total cost for this week is " << ( (Cost_Headphone) + (Cost_Mouse) + (Cost_USB) ) << "." << "\n";
    cout << "And your remainder is RM" << ( (Capital) - ( (Cost_Headphone) + (Cost_Mouse) + (Cost_USB) ) ) << "." << "\n\n";


    int Yes_or_No, Number_of_workers, Wage, Total_wage;


    Wage = 120.00;


    cout << "Do you hire worker(s) (ENTER 0 for NO and 1 for YES)? \n";
    cin >> Yes_or_No;


    if ( Yes_or_No ==1) {
        cout << "How many (Wage for worker(s) is RM 120.00 per week)? ";
        cin >> Number_of_workers;
        Total_wage = (Number_of_workers)*(Wage);
    }


    cout << "\n\n";
    cout << "So, shall we start our operations for this week? (ENTER 1 to START and 0 to CHECK your settings)";


}

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That is where I am currently now in progress...

Code:

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do
{
    //Your code
    char userChoice;
    std::cout<<"Try Again?";
    std::cin>>userChoice;
}while(userChoice=='y');

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