Work order group codes are the keys to associating your vendor mark up records with your vendors. Vendors that you want to apply the same pricing system to would be in the same group. The code is just a short identifier for the group name. For example, you may have a group of vendors that you add a high mark up value to. You may call this group "High" and make the code H. The code is described and stored in Work Order Information, Screen 2, of the Control File.