NewVM.json

{
  "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "newVMName": {
      "type": "string"
    },
    "labName": {
      "type": "string"
    },
    "size": {
      "type": "string"
    },
    "storageType": {
      "type": "string"
    },
    "customImage": {
      "type": "string"
    },
    "notes": {
      "type": "string"
    }
  },
  "variables": {
    "labSubnetName": "[concat(variables('labVirtualNetworkName'), 'Subnet')]",
    "labVirtualNetworkId": "[resourceId('Microsoft.DevTestLab/labs/virtualnetworks', parameters('labName'), variables('labVirtualNetworkName'))]",
    "labVirtualNetworkName": "[concat('Dtl', parameters('labName'))]",
    "vmId": "[resourceId ('Microsoft.DevTestLab/labs/virtualmachines', parameters('labName'), parameters('newVMName'))]",
    "vmName": "[concat(parameters('labName'), '/', parameters('newVMName'))]"
  },
  "resources": [
    {
      "apiVersion": "2017-04-26-preview",
      "type": "Microsoft.DevTestLab/labs/virtualmachines",
      "name": "[variables('vmName')]",
      "location": "[resourceGroup().location]",
      "properties": {
        "labVirtualNetworkId": "[variables('labVirtualNetworkId')]",
        "notes": "[parameters('notes')]",
        "size": "[parameters('size')]",
        "isAuthenticationWithSshKey": false,
        "labSubnetName": "[variables('labSubnetName')]",
        "disallowPublicIpAddress": true,
        "storageType": "[parameters('storageType')]",
        "allowClaim": true,
        "customImageId":"[parameters('customImage')]",
        "networkInterface": {
            "sharedPublicIpAddressConfiguration": {
                "inboundNatRules": [
                    {
                        "transportProtocol": "tcp",
                        "backendPort": 3389
                    }
                ]
            }
        }
      }
    }
  ],
  "outputs": {
    "labVMId": {
      "type": "string",
      "value": "[variables('vmId')]"
    }
  }
}