The Economic Order Quantity Setup screen allows you to set the resolution at which EOQ values are calculated.
Access this screen by going to Admin --> System Configuration --> Global EOQ Settings
EOQ's are calculated every day for each item.
These checkboxes control the attributes by which your items are grouped before EOQs are calculated.
When no checkboxes are checked, all items at all sites are thrown into one lump, and EOQ's are calculated according to your EOQ worksheet for your organization. Typically, having just one set of EOQ values is sufficient.
Occasionally, you may wish to enable EOQ calculation by Site/Facility, especially when you have warehouses that are of wildly differing characteristics, such as in different countries, or areas of the country that have much different features, such as insurance costs, cost of space, or higher rent, etc.