Script to populate subject

Script to populate subject

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.

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