The best method is to use your filters to add several contacts to groups. 

  1. On the left navigation, click Leads & Contacts > Contacts
  2. At the top of the screen, click the Filter button.
  3. Update your filter then click the to go back to your contact list view. 
    • Your contacts will update dynamically when changing your filters.
  4. Next to the Actions column, check the box that highlights all of your contacts. 
  5. At the top of the screen, click Actions > Set Groups
  6. Toggle the Add Groups option then choose the group(s).
    • NOTE: If you need to create a new group, input the name of the group and click Add New Group.
  7. Click Submit
    • Click Notify Shared Members to notify the shared users of a certain contact.