I am going to make a list of goods, how many there are of each kind each month. But some goods can be removed and some new supplyed each month. So I start with one woorkbook that lists all goods(book1). Then, I make one workbook with 12 sheets(book2), one for each month. I make references from the cells in book2, to book1. The idea is, that each time new goods arrives, the user can update this in book1 by adding a post. Then, I want this to reflect in each of the 12 sheets in book2, so the user do not have to add one post in each of the 12 sheets. How can I do this?