Importing contacts into a group is a two-step process. You will need to import your contacts into your address book, and then add them to your group.
Step 1: Import your contacts into your address book. We recommend entering a category for these new contacts (for example 'import 12/2/19') to make it easy to find them.
Step 2: In your address book, click the Groups tab and select the edit icon for the group you want to edit. Use the 'Advanced Search' and search for your new contacts using the category you entered in step 1. Then add those people to the group.