Add information from a field to the subject line

Add information from a field to the subject line

Hi,
 
Once a field has been populated in a template, I would like that information to be added to the subject line automatically.
 
e.g. A ticket is raised, with the basic information, a request is sent to a third party company (this is not done straight away, it may be a few days later just depends if the issue needs to be raised with the third party company) upon which they will reply to which will then include there ticketing system number, that number is manually added to the required field by the support rep, the next step I would like to happen is that the information that was added to the required field would then be added to the subject line.
 
Hope someone can help me.
 
thanks in advance
Cathy
 
 

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