Modify Subject to include custom text based on template used

Modify Subject to include custom text based on template used

Good afternoon.  We have employee transfer events sent via email to several areas of the business including I.T.   The subject as sent by HR is "April Transfer List Updated".  I have a business rule set up to apply our Transfer template when we edit the ticket.  I would like to also have the subject line automatically modified by a rule (or trigger, etc.) to add "User - HR - " in front of the subject line text as sent by our HR department.  So, for a ticket that is sent with "April Transfer List Updated", I'd like a script or something to change it to "User - HR - April Transfer List Updated".  Any assistance you can provide would be most appreciated!
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