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Merge contact cards in Contacts on Mac
If you have more than one card for a contact in an account, you can merge the cards. Merging cards combines the cards and keeps all the unique information in a single card.
In the Contacts app
on your Mac, do any of the following:
Look for duplicates: Choose Card > Look for Duplicates.
Merge duplicate cards that are found: Select the cards you want to merge, then choose Card > Merge Selected Cards.
When you use several accounts in Contacts, you may end up with several cards for a contact—for example, one card from Yahoo and one from Google. You can link the contact’s cards to streamline your list of contacts without merging the cards.
See alsoResolve duplicates while importing contacts into Contacts on MacAdd people and companies to Contacts on MacCreate groups of contacts in Contacts on Mac