To edit a Trunk Group, use the Update trunk group: “Trunk Group Name Window”.
There are three different ways to access this window.
From the Relationships → Trunk Groups All, Disabled, or Enabled window, find the Trunk Group to be edited. Click on the Name of the Trunk Group to access the Update trunk group window.
From the Relationships → Trunk Groups All, Disabled, or Enabled window, find the Trunk Group to be edited.