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Hello,

I'm Lena from the YouTrack Team.

As I can see, you already created the support request with the same question in our Support Center. We kindly ask you to avoid duplication of the questions because it negatively influenced the Support Team's performance and, as a result, the response time. 

However, the short answer for the other forum users:

You can achieve this behaviour using the Default Description workflow: https://www.jetbrains.com/help/youtrack/cloud/workflow-default-description.html. In this documentation section, you can learn more about workflows and how to create them from scratch or adapt the existing ones for your needs: https://www.jetbrains.com/help/youtrack/devportal/youtrack-workflow-reference.html