How can I add a new path on an existing apigateway using a cloudformation template

Question

The next template create a apigateway, path, method and trgiger with lambda but i need re-use a apigateway  exist and add the new path

Resources:
  PetStore:
    Type: 'AWS::ApiGateway::RestApi'
    Properties:
      Name: 'PetStore'

MyApiResource:
    Type: 'AWS::ApiGateway::Resource'
    Properties:
      RestApiId: "et3ca7fgs7"
      ParentId: !GetAtt PetStore.RootResourceId
      PathPart: stack

MyApiMethod:
    Type: "AWS::ApiGateway::Method"
    Properties:
      AuthorizationType: NONE
      HttpMethod: POST
      ResourceId: !Ref MyApiResource
      RestApiId: "et3ca7fgs7"  
      Integration:
        IntegrationHttpMethod: "POST"
        Type: "AWS_PROXY"
        Uri: "value arn"

FiltrosAPIPermission:
    Type: AWS::Lambda::Permission
    Properties:
      Action: lambda:invokeFunction
      FunctionName: "arn lambda"
      Principal: apigateway.amazonaws.com
      SourceArn: "arn apigatewat"

Answer

You must export the Rest API ID at the end of the current Cloudformation Template where the API Gateway is being created:

Outputs:

VPC:
       Description: Demo
       Value: !Ref PetStore
       Export:
              Name: PetStoreRestApiID

Then in the new Cloudformation template you must create a API Gateway Resource and reference the Rest API ID from the previous Cloudformation template:

Resources:

NewPathInAPI:
    "Type" : "AWS::ApiGateway::Resource"
     Properties:
      .
      .
      .
      RestApiId:
        Fn::ImportValue:
          PetStoreRestApiID

How can I add a new path on an existing apigateway using a cloudformation template

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