Via Metalization Loss
Via metalization loss is specified in the project editor on the Via metals tab in the Metals/Bricks page of the Circuit Settings dialog box which is opened by selecting Circuit - Settings. You click on the Add Via button to add a via metal type. Via metal types may be assigned to via polygons only. Please note that edge vias are a special case which use the planar metal type of the polygon to which they are attached. For a discussion of loss in edge vias, please see Edge Vias.
Sonnet allows you to use predefined via metals, such as gold and copper, using the global library. The global library allows you to define your own metal types as well. There is also a local metal library which can be created for an individual or to share between users.