Thanks for your reply! Can you share an example of what type of environment values you’re using with this field? If this is for platform environments (e.g. browser, operating system, device, etc), then TestRail wouldn’t handle this on a user level and wouldn’t generally require a separate custom field for this. You can manage your environments when using TestRail’s test plan configurations (which creates a separate test run per environment/configuration), and you can learn more about how this works on our website here:
In this method, any result that you enter for a linked defect or reference would include the environment/configuration in the title already when viewing this via the TestRail for JIRA add-on in JIRA.
You can also add default values on a global level for various field types, and this would also be supported for dropdown fields as well. You can simply edit the field and under the projects and options section, click edit next to the option and choose the default value for the field. This would be set globally and you wouldn’t be able to set this on a per-user basis.
Hope this helps!