iCloud: Import a contact into iCloud Contacts
Contacts can import vCard format version 3.0 and later.
Click the Action pop-up menu in the sidebar, then choose Import vCard.
Select a vCard to import.
If the vCard contains contact information for more than one person, each contact becomes a separate entry.
Contacts from imported vCards are added to the All Contacts group. You can add contacts to any other group by dragging them to the desired group.
If you can’t import a vCard, it may exceed the iCloud Contacts size limit. See the Apple Support article Limits for iCloud Contacts, Calendars, Reminders, and Bookmarks.