I have over 50 books for sale. how I can create a list of books for sale in amazon from my excel list?

I have sold stuff (not books, tho) on Amazon.com, and each item must be listed separately, on its' site page.


A.com's programming creates a 'seller's list of a client's items automaticly from these individual listings, without input/labor on the seller's part.I have over 50 books for sale. how I can create a list of books for sale in amazon from my excel list?
I think Amazon itself has the program to do that with.