Order Costs lets you set the Cost used for order line items for reference. On invoicing, this is replaced with the Avg Cost of on hand inventory. Seeing another cost like Vendor Cost or Landed Cost may help when entering orders to set the best pricing.
Before changing this setting from the default, Avg Cost, consider any effects for commission or profit reporting, since the invoice will continue to use Avg Cost. Please contact firstname.lastname@example.org if you have questions.