How Do I Import 75+ Groups
CiviCRM by default does not have an option to import groups. However, there is a third-party extension that provides a user interface to import anything through the more powerful CiviCRM API.

First, install the API CSV GUI extension:
https://civicrm.org/extensions/api-csv-import-gui

Then click the new menu item that appears and select Entity to Import: Group.

Version 1.1 includes the wrong alias path, so remember to type "civicrm/" before "csvimporter/import" or else a Page Not Found error will be thrown.  

mywebsite.com/csvimporter/import


should really be...

mywebsite.com/civicrm/csvimporter/import


Alternatively, install from git: https://github.com/eileenmcnaughton/nz.co.fuzion.csvimport