Create and change Smart Groups in Contacts on Mac
You can create a Smart Group that automatically organises contacts into groups, based on criteria you specify. For example, you can create a Smart Group called Book Club that includes any contact card with "book" in the Note field. Whenever you add or remove “book” in that field, the Smart Group is automatically updated to include or exclude those contacts.
Tip: Contacts provides a default Smart Group called Last Import that automatically includes the contacts you most recently imported.
Create a Smart Group
Smart Groups can include contacts from any account.
In the Contacts app
on your Mac, choose File > New Smart Group.Enter a name for the Smart Group.
For example, if you create a Smart Group to organise contacts who live in Sydney, you can name it SY.
Specify the criteria.
Set the first condition: Click the first pop-up menu, choose an option (such as Name, Company or City), then complete the condition using the other menus or fields that are shown (they vary depending on your choice in the first pop-up menu).
For example, to include contacts who live in Sydney, choose City from the first pop-up menu and “is” from the second one, then enter Sydney in the text field. Any contact whose city is Sydney is automatically included.
Add or remove conditions: To set additional conditions, click the Add button
(you may need to scroll to see them). To remove a condition, click its Remove button 
. Set the scope of multiple conditions: If you have at least two conditions, a pop-up menu appears that lets you choose whether a contact must meet any or all of the conditions to be included in the Smart Group.
Click OK.
Whenever you select your Smart Group in the sidebar, contacts that match its criteria are listed.
Edit a Smart Group
You can’t add or remove contacts directly in a Smart Group. To change who’s included in the Smart Group, you must change its criteria.
In the Contacts app
on your Mac, select a Smart Group in the sidebar, then choose Edit > Edit Smart Group.Change, add or remove conditions.
Click OK.
Rename a Smart Group
In the Contacts app
on your Mac, select a Smart Group in the sidebar.Choose Edit > Rename Group, then enter the new name.