如何将在一个下拉菜单中选择的选项的属性添加到另一个下拉菜单？

I want to add the list of clubs of a selected option from the first dropdown menu to my second dropdown menu. For example, if a user selects 'England' when they are selecting a country in the first dropdown menu, then the options for the second dropdown menu should be all the elements of englandclubs (the clubs property of the england object) - where each element of that array is an option (i.e. Arsenal F.C., Aston Villa F.C., ..., West Ham United F.C.).I want to add the list of clubs of a selected o