Apple iPad For iOS 4.3 - Manual (Page 94)

Unified Contacts
When you sync contacts with multiple accounts, you might have entries for the same
person in more than one account. To keep redundant contacts from appearing in the
All Contacts list, you can link contacts that have the same first and last name (but not
a different prefix, suffix, or middle name) and display them as a single unified contact.
When you view a unified contact, the title Unified Info appears at the bottom of the
contact’s entry. Unified contacts appear only when you view the All Contacts list.
Link contacts: Find the first contact that you want to link, then tap Edit. Tap
and
select the other contact, then tap Link.
When a contact is linked, tap the silhouette icon to view, add, or delete linked entries.
Linked contacts aren’t merged. Unless you edit a unified contact, the contact in each
source account remains separate. If you change information in a unified contact, the
changes are copied to each source account that information already exists in. If you
add information to a unified contact, that information is added to the contact in each
source account.
94 Chapter 13 Contacts