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).
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.
To use the CI Job method, navigate to the Deploy Options tab:
And then select the Git source radio button: