This script can be used to set item options during sales. It also sets the item price based on the chosen option.

Watch below video on how to do this:
https://youtu.be/f9BFX2kIveQ

Administrator Menu > Maintenance > Resources
Use the below code in product properties:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
<entry key="SMALL">0</entry>
<entry key="MEDIUM">2</entry>
<entry key="LARGE">4</entry>
</properties>

Use the below clode in event.addline:

if (line.isProductCom() && ticket.getLinesCount() > 0) 
{
    if(ticket.getLine(index).getProperty(line.printName())!=null)
    {
        ticket.getLine(index).setSalePrice(ticket.getLine(index).getSalePrice() +
        ticket.parseDouble(ticket.getLine(index).getProperty(line.printName())));
    }
    ticket.getLine(index).setProperty("product.name", ticket.getLine(index).getProductName() + " " + line.printName());
    return "Cancel";
}

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