PackagePlans/Advanced/Package Subscription Groups
From Emersion
Package Subscription Groups Overview
The purpose of package subscription groups is to
a) Automate the cancellation of all packages in a group, if one of the packages in the group is cancelled. b) Produce a popup warning you of this when you cancel one of the packages.
You will need to ask Emersion to enable this Account Feature, if you don't already have it.
Create your Package Subscription Group
First and foremost you must create your Package Subscription Group. Navigate to one your packages you plan to make part of the group.
Create A Package Group:
By default, this package will be the primary subscription in the group. You can also remove the group as well with the remove link.