How to show multiple copies in TinyCat

I have multiple copies of the same book which I catalogued into LibraryThing but when I look at my TinyCat records it only shows one. And when that copy is checked out, it says the book is unavaliable even though there are multiple copies. Is there a way for multiple copies to show up on TinyCat or do I have to put in duplicates of books individually on LibraryThing?

You have to enter each copy separately.