What is Hosting Add-On?
Hosting add-on is a set of hosting resources and corresponding quotas. Hosting resources here is a virtual or physical server (set of services).
Hosting add-ons allow extend quotas of existing hosting space without affecting its parent hosting plan. Think hosting add-on as a small part of hosting plan with few quotas assigned.
To view the list of hosting add-ons of serveradmin or some reseller click Hosting Add-Ons item in the Account menu.
To add a new hosting plan click Create Hosting Add-On button. You'll be redirected to Edit Hosting Add-On screen shown below:
Specify the name and description of hosting add-on and set its availability (visibility) to customers.
Specify add-on resource groups and their quotas.
Click "Save" button.