An Example of how to do a cross resource group deployment using Microsoft Azure ARM Templates.

cross_resource_group_deployement_snippet.json

{
  "type": "Microsoft.Resources/deployments",
  "properties": {
    "mode": "Incremental",
    "template": {
      "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
      "contentVersion": "1.0.0.0",
      "resources": [
        {
          "apiVersion": "2016-04-01",
          "name": "[concat('example.com', '/', 'test')]",
          "location": "westus",
          "type": "Microsoft.Network/dnszones/A",
          "properties": {
            "TTL": "61",
            "ARecords": [
              {
                "ipv4Address": "[reference(resourceId(resourceGroup().name, 'Microsoft.Network/publicIPAddresses', 'my-virtual-machine-pip-eth0'), providers('Microsoft.Network', 'publicIPAddresses').apiVersions[0]).ipAddress]"
              }
            ]
          }
        }
      ]
    }
  },
  "apiVersion": "2017-05-10",
  "resourceGroup": "example-com-dns-zone-rg",
  "dependsOn": [
    "[concat('Microsoft.Network/publicIPAddresses/', 'my-virtual-machine-pip-eth0')]"
  ],
  "name": "my-virtual-machine-eth0-dns-record"
}