Or could we present a different "public" facing website via the existing install that is just branded differently?
Hope I'm making sense.
Since WHD is licensed by technician you could add tech licenses to your existing key and add your procurement team to your existing instance.
You could also create a new WHD instance but your license key can only be associated with a single install. If you created a 2nd instance you could copy your existing DB over to the procurement instance if you'd like.
I'll give you a call to get more details and we can figure out which option would be best suited for you guys.