To setup a package, go to Setup > Products/Services. From there, you can create your product and configure the pricing and other options as necessary. When it comes to the Module Settings tab, you should do the following:
Set the Module Name to Helm4. You will then be asked for the Role ID and Plan ID. To find the Role ID, in Helm go to Account Settings > Customer Account Roles. You can then click on the Excel download icon to get a list of roles & their IDs.
The download gives you an Excel sheet as follows with each role and it's ID number that you need to enter into WHMCS.
You need the role ID of the role this package should have which is highlighted above. You then need to do the same to get the Plan IDs by going to My Plans and then clicking the Excel download link as shown below.
The download produces a list like the one below in Excel where you can then take the Plan ID from which you need to enter into WHMCS.
Server Modules
cPanel/WHM - DirectAdmin - Plesk - Helm 3 - Helm 4 - Ensim - InterWorx - DotNetPanel
Lxadmin - Virtualmin Pro - XPanel - HyperVM - FluidVM - SolusVM - Cloudmin - WHMSonic
CentovaCast - SCPanel - CastControl - GameCP - TCAdmin - Reseller Central - Auto Release
Registrar Modules
Enom - ResellerClub - Nominet - OpenSRS - ResellOne - OnlineNIC - PlanetDomain
DistributeIT - TPPInternet - RegisterFly - Stargate - Namecheap - NetEarthOne
12Register - Registercom - DotDNS - WebNIC - Dot.TK - HexoNet - Realtime Register
Fraud Modules
MaxMind - VariLogiX FraudCall - Telesign
Selected Gateway Modules
Payflow Pro - Authorize.net - BluePay - Quantum Gateway - eWay - eProcessingNetwork
InternetSecure - LinkPoint - SecPay - ProtX - PSIGate - WorldPay Invisible - NaviGate
Merchant Partners - PayOffline - Offline Credit Card - PayPal - ChronoPay - 2CheckOut - Google CheckOut
WorldPay - E-Gold - Gate2Shop - F2B - PagSeguro - NoChex - AlertPay - ProtX VPS Form - Paymex
CashU - Liberty Reserve - StormPay - Paymate AU and NZ - Payson - BRPay - Boleto - MoneyBookers
PayOffline - Mail In Payment - Bank Transfer - USA ePay - Pay Junction - PayPal Website Payments Pro