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Go to Manage > Knowledge and click on "Creating Patterns". That takes you to a page with TPL examples. Look at the one called template_cmdb_hostname_override. That shows how to write a mapping extension that changes data on the ComputerSystem CI. It changes the HostName attribute, but exactly the same approach will work for any other attribute, such as ShortDescription.
We don´t know about an example for this option. We have made a new pattern based on this template and it runs fine.