Add a person to a Group using the Contact > Groups tab.
Using Groups lets to group your contacts.
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Adding a Contact to a Group
Open your Contact select the Groups tab and tick Edit button and add the contact to the groups that you want.
A contact can be in multiple Groups
Bulk add or remove Contacts from a Group
Select your Contacts and then Tools > Groups
You can quickly add/remove contacts from a group using the Tools then Groups button.
New Groups
You can create your own Groups in Settings > Office > People tab - Groups.