If you are a release manager looking for a way to quickly deploy a large number of work items or deployments, you can use a CI Job with the Essentials option called "deploy all files committed since the last successful build." (see screenshot below).
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Alternatively, you can use the Merge Work Items feature. Note that in both cases you lose the audit trail provided by doing individual deployments associated with a user story.
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To use the CI Job method, navigate to the Deploy Options tab:

And then select the Git source radio button: