How to create a report which compares sales between suppliers?

A quick way compare sales between suppliers is by going to 'Supplier Menu'/'Stock Listing by Supplier Codes'. This page will show supplier details for all items sold, in order of highest sold quantity. You can also create supplier orders from this page by selecting the relevant item and clicking 'Add'. This will add the item to the most recent supplier order, if one exists, or create a new order if one does not already exist. To view the order after adding the items to it, click 'View Updated Orders'.

Another way to compare supplier performance is by using the 'Listing of Items Sold' report. This report is located under 'Reports Menu'/'Sales Reports'/'SAL003 - Listing of items sold', and you can restrict the report by date and supplier.