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Showing content from https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-cloudformation-interface.html below:

Organizing CloudFormation parameters with AWS::CloudFormation::Interface metadata

AWS::CloudFormation::Interface is a metadata key that defines how parameters are grouped and sorted in the CloudFormation console. By default, the console lists input parameters in alphabetical order by their logical IDs when you create or update stacks in the console. By using this key, you can define your own parameter grouping and ordering so that users can efficiently specify parameter values. For example, you could group all EC2-related parameters in one group and all VPC-related parameters in another group.

In the metadata key, you can specify the groups to create, the parameters to include in each group, and the order in which the console shows each parameter within its group.

You can also define labels for parameters. A label is a friendly name or description that the console displays instead of a parameter's logical ID. Labels are useful for helping users understand the values to specify for each parameter. For example, you could label a KeyPair parameter Select an EC2 key pair.

All parameters that you reference in the metadata key must be declared in the Parameters section of the template.

Only the CloudFormation console uses the AWS::CloudFormation::Interface metadata key. AWS CLI and API calls don't use this key.

To declare this entity in your CloudFormation template, use the following syntax:

"Metadata" : {
  "AWS::CloudFormation::Interface" : {
    "ParameterGroups": [
      {
        "Label": {
          "default": "Group Label"
        },
        "Parameters": [
          "Parameter1",
          "Parameter2"
        ]
      }
    ],
    "ParameterLabels": {
      "Parameter1": {
        "default": "Friendly Name for Parameter1"
      }
    }
  }
}

Metadata:
  AWS::CloudFormation::Interface:
    ParameterGroups:
      - Label:
          default: Group Label
        Parameters:
          - Parameter1
          - Parameter2
    ParameterLabels:
      Parameter1:
        default: Friendly Name for Parameter1

ParameterGroups

A list of parameter group types, where you specify group names, the parameters in each group, and the order in which the parameters are shown.

Required: No

Label

A name for the parameter group.

Required: No

default

The default label that the CloudFormation console uses to name a parameter group.

Required: No

Type: String

Parameters

A list of case-sensitive parameter logical IDs to include in the group. Parameters must already be defined in the Parameters section of the template. A parameter can be included in only one parameter group.

The console lists the parameters that you don't associate with a parameter group in alphabetical order in the Other parameters group.

Required: No

Type: List of String values

ParameterLabels

A mapping of parameters and their friendly names that the CloudFormation console shows when a stack is created or updated.

Required: No

Parameter label

A label for a parameter. The label defines a friendly name or description that the CloudFormation console shows on the Specify Parameters page when a stack is created or updated. The parameter label must be the case-sensitive logical ID of a valid parameter that has been declared in the Parameters section of the template.

Required: No

default

The default label that the CloudFormation console uses to name a parameter.

Required: No

Type: String

The following example defines two parameter groups: Network Configuration and Amazon EC2 Configuration. The Network Configuration group includes the VPCID, SubnetId, and SecurityGroupID parameters, which are defined in the Parameters section of the template (not shown). The order in which the console shows these parameters is defined by the order in which the parameters are listed, starting with the VPCID parameter. The example similarly groups and orders the Amazon EC2 Configuration parameters.

The example also defines a label for the VPCID parameter. The console will show Which VPC should this be deployed to? instead of the parameter's logical ID (VPCID).

"Metadata" : {
  "AWS::CloudFormation::Interface" : {
    "ParameterGroups" : [
      {
        "Label" : { "default" : "Network Configuration" },
        "Parameters" : [ "VPCID", "SubnetId", "SecurityGroupID" ]
      },
      {
        "Label" : { "default":"Amazon EC2 Configuration" },
        "Parameters" : [ "InstanceType", "KeyName" ]
      }
    ],
    "ParameterLabels" : {
      "VPCID" : { "default" : "Which VPC should this be deployed to?" }
    }
  }
}

Metadata: 
  AWS::CloudFormation::Interface: 
    ParameterGroups: 
      - Label: 
          default: "Network Configuration"
        Parameters: 
          - VPCID
          - SubnetId
          - SecurityGroupID
      - Label: 
          default: "Amazon EC2 Configuration"
        Parameters: 
          - InstanceType
          - KeyName
    ParameterLabels: 
      VPCID: 
        default: "Which VPC should this be deployed to?"

Using the metadata key from this example, the following figure shows how the console displays parameter groups when a stack is created or updated: Parameter groups in the console

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