To access the Feature History window:
Open Customer Management.
Select the Services tab on a Customer
Select Properties > Features History.
(Show Picture)

All of the plans and feature changes that have occurred for the particular service are displayed:

The Features History window displays the following information:
1st Column
An icon depicting the type of service. See Catalog Item Icons.
Change Date
Displays the creation date of the line item.
Effective Date
Displays the start date of the items listed under the "To" column.
Service Number
Displays the service number of the items listed under the "to" column.
Type
Displays one of the values:
Exclusive Group description, if applicable
Product Catalog Category description, if applicable
Product Catalog description, if applicable.
System Order Detail Description
To
Displays the "To" item only once a feature has been added or altered. This column is left blank if a disconnect, without swapping, is performed.
From
Displays the "From" item only once a feature has been added or altered. This column is left blank if a disconnect, without swapping, is performed.
Right-click Menu Options
View Event Log
Select this option to view the event log.
View Related Orders
Select this option to view all orders related to this particular service.
View Related Line Items
Select this option to view all line items related to this particular service.