There is an excellent post and associated plug-in regarding this topic here: http://communities.mentor.com/docs/DOC-1258. You already have defined the termianal material on the device pins in the library and this plug-in will propagate that to the Wire so terminal selection in Harness will use it.
Brian, I'm sorry that I did not notice originally that you are using VeSys 2.0, which does not support the use of plug-ins. That means my proposed solution will not work and I'm not aware of an alternative.
You should have access to the document Glennr refers to in his post. Although you can not use the query approach (in VeSys), reference DOC-1223 "Terminal Plating Drivers in Capital Harness XC" will provide some helpful information the subject. Follow the link or search (in Communities) for "DOC-1223" or "Terminal Plating Drivers".
Hope that helps,