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Currently, you can't add custom fields to Test Runs since they're not JIRA issues.

You may add CFs to Tests, however they’re not copied to the Test Run. Custom fields at Tests can be seen as complementary, non-relevant information

Xray provided custom fields

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TestRunStatus

dd

Test Set Status

dd

Adding your own custom fields

You may add CFs to Tests, however they’re not copied to the Test Run. Custom fields at Tests can be seen as complementary, non-relevant information.

But adding custom fields is not limited to the Test issue type; they can also be added to other Xray issue types, including the Test Execution and the Test Plan. For example, in the Test Execution you could add a custom field to identify the browser version.

Recommendations

• Don’t reinvent the wheel; use standard fields, such as labels and components, and avoid creating custom fields without need
• Remember that custom fields added to Tests are not copied to Test Runs, so they’re volatile/informative only; they’re not part of the specification