Is it possible to use a script to auto populate the subject, based on it's group...
eg....
Support Group
Procurement
Subject (auto populated with script)
Procurement Status - Purchase Order Number
Call is then moved to a different group which adds another field to the start of the subject...
Support Group
Reception
Subject (auto populated with script)
Reception Status - Procurement Status - Purchase Order Number
The incident will be using the same incident template through out.