Jeff it’s easy.
Typically the Dictionaries are located under the wmEDIforTN package. That folder will have the following folder structure EDIFFSchema.X12.V4010
You will find a Dictionary and Schemas (T863)in the folder.
Open up the schema and locate the segment and element that you wish to change on the Flat File Structure tab. Note what field the element is Referenced from. For example the ST02 is reference from field 329.
Open the Dictionary and go to the Field Definitions. Scroll down to the desired field (329 in my example). You will see the code list in the properties panel. Add the code you want here.
You will of course have to lock them for edit to be able to make these changes.
HTH
#webMethods#edi#Integration-Server-and-ESB