A product may be assigned multiple entries. Also, an entry may be assigned to (shared by) multiple products.
Notes:
When multiple SKUs with the same special number are added to a service, only one instance of the number is added to the phone book.
When a product is removed from the service, the corresponding numbers are removed from the phone book.
Note
Before a corresponding number is removed, the IDI platform will check if there is at least one active SKU with the phone number. If no, the associated number is removed from the phone book. If yes, the associated number is retained in the phone book.
Adding
To add a special number to a product:
Open the New/Edit product form in the Product Catalog.
Select the Phone Book tab.
Select the special number from the list of Available Special Numbers (left pane) and click the right arrow (>).
(Show picture)

Repeat step 3 to add as many numbers as needed on the product.
Removing
To remove a number from the product, select the special number from the list of Assigned Special Numbers (right pane) and click the left (<) arrow.