I have "group contacts" to import, but need to remove an individual(s).

To add or remove someone from a group contact, click on the Accounts heading on the upper left, above the heading above the green stripe. Click on Contact Groups.

Use the navigation arrows on the lower left side of the contact groups window to find the contact group that you need to edit. Check or un-check the box next to an individual’s name to add or remove that person. Click the OK button.