Webtrends Analytics 9 Adminstration Guide, November 2012
You can track campaigns using legacy functionality and without the WT.mc_id parameter.
Specify the URL of the landing page or referring page in Webtrends Analytics 9 Administration to define campaigns. You can then create custom reports using the Campaign (V6) and Campaign Type (V6) standard dimensions. You can also create the Same Visit Campaign ID and Same Visit Campaign Name reports.
You cannot use campaigns configured through Administration to create Campaign Drilldown reports or Webtrends Segments reports, or to track campaign history. These reports rely on functionality introduced in v7.x.