I am skeptical about "component knows what data it needs". For example, I have a component with two combo boxes: in the first combo box I select a country and t

I am skeptical about "component knows what data it needs". For example, I have a component with two combo boxes: in the first combo box I select a country and the second combo box is filled with cities of that country. Now I need a similar thing: in one combo box I choose car brand, and the second combo box is filled with models of that brand. Can I reuse my existing component? If the component knows what data it displays, it can not be used to display different data.