You'd have to strategically replace stuff already listed in the item code list. There are ways to interface with the system, but adding custom codes, like DarthParametric said, isn't possible. Familiarity with the KotOR Tool Templates.bif, Item section. Look at a_light /a_medium / a_heavy / a_robe items. I wrote a Nexus Article about how those items are sectioned, by letter C through K, referring to model in the appeareance.2da