With PreO you just set up your supplier(s) and Items that you have for sale and then whenever someone places an order you can easily see how many of each product is required, what someone owes etc. PreO allows you to email or print invoices for the customer, packing lists for yourself, and order updates for your suppliers. Its great for things like Bake sales where you can get people to pre-order their food so that there is no waste, and no-one is disappointed that the Brownies they wanted most have sold out. Also great for organising meals where you have to take pre-orders so you can keep track of who ordered what and who has paid.