How to create a report that shows all the stock by Supplier?

This information can be viewed through the 'Stock Listing by Supplier Code Report'. This report is located in 'Reports Menu'/'Supplier Reports'/'SUR001 - Stock Listing by Supplier Report'. This report shows Supplier, Supplier Code, Stock No., Description, Cost Price, Retail Price, Markup, Date In, Qty., and the Fast Seller Index.

You could also use the 'Supplier Performance' feature by clicking on 'Supplier Menu'/'Stock Listing by Supplier Order'. This feature also allows you to re-order items from suppliers.