環境は以下の通りです。

windows server 2012R2
ADDS + DNS がインストール済みのドメインコントローラ

上記サイトによると dnscmd というのを使うと簡単とのことなので試してみます。

PS C:\Users\Administrator> dnscmd /?

使用法: DnsCmd <サーバー> /ZoneInfo <ゾーン名> [<プロパティ>]
  <プロパティ> -- 表示するゾーン プロパティ
  例:
    AllowUpdate
    DsIntegrated
    Aging
    RefreshInterval
    NoRefreshInterval
    IsSigned
    Keymaster
    IsKeymaster
    SignWithNSEC3
    NSEC3HashAlgorithm
    NSEC3Iterations
    NSEC3RandomSaltLength
    NSEC3UserSalt
    NSEC3CurrentSalt
    NSEC3OptOut
    MaintainTrustAnchor
    SignatureInceptionOffset
    DNSKEYRecordSetTTL
    DSRecordSetTTL
    SecureDelegationPollingPeriod
    DsRecordAlgorithms
    RFC5011KeyRollovers
    SigningKeyDescriptors
    PropagationTime
    ParentHasSecureDelegation

今後のバージョンの Windows では、dnscmd.exe が削除される可能性があります。

現在 dnscmd.exe を使用して DNS サーバーを構成および管理している場合は、
Windows PowerShell に移行することをお勧めします。

DNS サーバー管理のコマンドの一覧を表示するには、Windows PowerShell プロンプト
で、「Get-Command -Module DnsServer」と入力します。DNS の Windows PowerShell
コマンドの詳細については、
http://go.microsoft.com/fwlink/?LinkId=217627 を参照してください。

使うなと言われたのと、dnscmd は結果をオブジェクトとして扱えないので DnsServer モジュールを使ってみることにします。

PS C:\Users\Administrator> get-command -module dnsserver

CommandType     Name                                               ModuleName
-----------     ----                                               ----------
Alias           Export-DnsServerTrustAnchor                        dnsserver
Function        Add-DnsServerConditionalForwarderZone              dnsserver
Function        Add-DnsServerDirectoryPartition                    dnsserver
Function        Add-DnsServerForwarder                             dnsserver
Function        Add-DnsServerPrimaryZone                           dnsserver
Function        Add-DnsServerResourceRecord                        dnsserver
Function        Add-DnsServerResourceRecordA                       dnsserver
Function        Add-DnsServerResourceRecordAAAA                    dnsserver
Function        Add-DnsServerResourceRecordCName                   dnsserver
Function        Add-DnsServerResourceRecordDnsKey                  dnsserver
Function        Add-DnsServerResourceRecordDS                      dnsserver
Function        Add-DnsServerResourceRecordMX                      dnsserver
Function        Add-DnsServerResourceRecordPtr                     dnsserver
Function        Add-DnsServerRootHint                              dnsserver
Function        Add-DnsServerSecondaryZone                         dnsserver
Function        Add-DnsServerSigningKey                            dnsserver
Function        Add-DnsServerStubZone                              dnsserver
Function        Add-DnsServerTrustAnchor                           dnsserver
Function        Add-DnsServerZoneDelegation                        dnsserver
Function        Clear-DnsServerCache                               dnsserver
Function        Clear-DnsServerStatistics                          dnsserver
Function        ConvertTo-DnsServerPrimaryZone                     dnsserver
Function        ConvertTo-DnsServerSecondaryZone                   dnsserver
Function        Disable-DnsServerSigningKeyRollover                dnsserver
Function        Enable-DnsServerSigningKeyRollover                 dnsserver
Function        Export-DnsServerDnsSecPublicKey                    dnsserver
Function        Export-DnsServerZone                               dnsserver
Function        Get-DnsServer                                      dnsserver
Function        Get-DnsServerCache                                 dnsserver
Function        Get-DnsServerDiagnostics                           dnsserver
Function        Get-DnsServerDirectoryPartition                    dnsserver
Function        Get-DnsServerDnsSecZoneSetting                     dnsserver
Function        Get-DnsServerDsSetting                             dnsserver
Function        Get-DnsServerEDns                                  dnsserver
Function        Get-DnsServerForwarder                             dnsserver
Function        Get-DnsServerGlobalNameZone                        dnsserver
Function        Get-DnsServerGlobalQueryBlockList                  dnsserver
Function        Get-DnsServerRecursion                             dnsserver
Function        Get-DnsServerResourceRecord                        dnsserver
Function        Get-DnsServerRootHint                              dnsserver
Function        Get-DnsServerScavenging                            dnsserver
Function        Get-DnsServerSetting                               dnsserver
Function        Get-DnsServerSigningKey                            dnsserver
Function        Get-DnsServerStatistics                            dnsserver
Function        Get-DnsServerTrustAnchor                           dnsserver
Function        Get-DnsServerTrustPoint                            dnsserver
Function        Get-DnsServerZone                                  dnsserver
Function        Get-DnsServerZoneAging                             dnsserver
Function        Get-DnsServerZoneDelegation                        dnsserver
Function        Import-DnsServerResourceRecordDS                   dnsserver
Function        Import-DnsServerRootHint                           dnsserver
Function        Import-DnsServerTrustAnchor                        dnsserver
Function        Invoke-DnsServerSigningKeyRollover                 dnsserver
Function        Invoke-DnsServerZoneSign                           dnsserver
Function        Invoke-DnsServerZoneUnsign                         dnsserver
Function        Register-DnsServerDirectoryPartition               dnsserver
Function        Remove-DnsServerDirectoryPartition                 dnsserver
Function        Remove-DnsServerForwarder                          dnsserver
Function        Remove-DnsServerResourceRecord                     dnsserver
Function        Remove-DnsServerRootHint                           dnsserver
Function        Remove-DnsServerSigningKey                         dnsserver
Function        Remove-DnsServerTrustAnchor                        dnsserver
Function        Remove-DnsServerZone                               dnsserver
Function        Remove-DnsServerZoneDelegation                     dnsserver
Function        Reset-DnsServerZoneKeyMasterRole                   dnsserver
Function        Restore-DnsServerPrimaryZone                       dnsserver
Function        Restore-DnsServerSecondaryZone                     dnsserver
Function        Resume-DnsServerZone                               dnsserver
Function        Set-DnsServer                                      dnsserver
Function        Set-DnsServerCache                                 dnsserver
Function        Set-DnsServerConditionalForwarderZone              dnsserver
Function        Set-DnsServerDiagnostics                           dnsserver
Function        Set-DnsServerDnsSecZoneSetting                     dnsserver
Function        Set-DnsServerDsSetting                             dnsserver
Function        Set-DnsServerEDns                                  dnsserver
Function        Set-DnsServerForwarder                             dnsserver
Function        Set-DnsServerGlobalNameZone                        dnsserver
Function        Set-DnsServerGlobalQueryBlockList                  dnsserver
Function        Set-DnsServerPrimaryZone                           dnsserver
Function        Set-DnsServerRecursion                             dnsserver
Function        Set-DnsServerResourceRecord                        dnsserver
Function        Set-DnsServerResourceRecordAging                   dnsserver
Function        Set-DnsServerRootHint                              dnsserver
Function        Set-DnsServerScavenging                            dnsserver
Function        Set-DnsServerSecondaryZone                         dnsserver
Function        Set-DnsServerSetting                               dnsserver
Function        Set-DnsServerSigningKey                            dnsserver
Function        Set-DnsServerStubZone                              dnsserver
Function        Set-DnsServerZoneAging                             dnsserver
Function        Set-DnsServerZoneDelegation                        dnsserver
Function        Show-DnsServerCache                                dnsserver
Function        Show-DnsServerKeyStorageProvider                   dnsserver
Function        Start-DnsServerScavenging                          dnsserver
Function        Start-DnsServerZoneTransfer                        dnsserver
Function        Step-DnsServerSigningKeyRollover                   dnsserver
Function        Suspend-DnsServerZone                              dnsserver
Function        Sync-DnsServerZone                                 dnsserver
Function        Test-DnsServer                                     dnsserver
Function        Test-DnsServerDnsSecZoneSetting                    dnsserver
Function        Unregister-DnsServerDirectoryPartition             dnsserver
Function        Update-DnsServerTrustPoint                         dnsserver

DnsShell はインストールが必要なようなので、インストール不要なこちらを利用することにします。

条件付きフォワーダの設定は Add-DnsServerConditionalForwarderZone を使えばよさそうです。
今回は Active Directory 環境の DNS サーバなので、以下の様に設定してみました。

Add-DnsServerConditionalForwarderZone `
    -Name "hogehoge.com" `
    -MasterServers 10.0.0.2,10.0.0.3 `
    -ReplicationScope "Forest"

これでフォレスト内のDNSサーバ間でレプリケーションもされます。
また、確認は Get-DnsServerZone を使うとよさそうです。ZoneType が Forwarder になっています。

PS C:\Users\Administrator> Get-DnsServerZone

ZoneName                            ZoneType        IsAutoCreated   IsDsIntegrated  IsReverseLookupZone  IsSigned
--------                            --------        -------------   --------------  -------------------  --------
_msdcs.example.local                Primary         False           True            False                False
0.in-addr.arpa                      Primary         True            False           True                 False
127.in-addr.arpa                    Primary         True            False           True                 False
255.in-addr.arpa                    Primary         True            False           True                 False
hogehoge.com                        Forwarder       False           True            False
example.local                       Primary         False           True            False                False
TrustAnchors                        Primary         False           True            False                False

dnsmgmt.msc でも追加されていることが確認できました。