Store CC question and LV?

The Macy's here has at tops Coach. I was going to call the NY store that has a boutique and order something if they do that. I want to know if you can use them. (I don't want to call and ask them because I would feel stupid)
I know that the Macy*s at the Roosevelt Field Mall (Garden City, L.I., NY) has an LV boutique right in the middle of the store. I don't see why you wouldn't be able to use your store charge card.