Hi Glen Martin - Take a look at this KB article: SolarWinds Knowledge Base :: How to Use Action Rules to Deal With Keywords in The Email 'Subject' Field
Hopefully this helps. Also, have you seen the Library & Support pages on thwack? They are basically your one stop shop for all things related to our products. For instance, I found the KB I reference above on the WHD Library & Support page: Web Help Desk (WHD) - Updated May 20, 2014
Let us know if we can assist further.
Danielle