如何将组合箱的项目设置为另一个

I'm populating a VBA ComboBox with some data from a Workshet. As it is populated depending on the choice of the user, sometimes some levels are should not be populated, because they do not have data. When such a thing happens, I want to populate the items of a ComboBox with the same of another. How can a do that?I'm populating a VBA ComboBox with some data fr