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.