az dms --help Manage Azure Data Migration Service (DMS) instances.

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Group
    az dms : Manage Azure Data Migration Service (DMS) instances.

Subgroups:
    project      : Manage Projects for an instance of the Data Migration Service.

Commands:
    check-name   : Check if a given DMS instance name is available in a given region as well as the
                   name's validity.
    check-status : Perform a health check and return the status of the service and virtual machine
                   size.
    create       : Create an instance of the Data Migration Service.
    delete       : Delete an instance of the Data Migration Service.
    list         : List the DMS instances within your currently configured subscription (to set this
                   use "az account set"). If provided, only show the instances within a given
                   resource group.
    list-skus    : List the SKUs that are supported by the Data Migration Service.
    show         : Show the details for an instance of the Data Migration Service.
    start        : Start an instance of the Data Migration Service. It can then be used to run data
                   migrations.
    stop         : Stop an instance of the Data Migration Service. While stopped, it can't be used
                   to run data migrations and the owner won't be billed.
    wait         : Place the CLI in a waiting state until a condition of the DMS instance is met.