- Click on System Config > Account Types from the left menu.
- Scroll down the page to search for and click on the Name of the Account Group Field you want to add accounts to.
- Go to the Groups tab.
- Select the number of groups you wish to add and click Add More Groups.
- Enter a Description for each group.
Save Changes to add your groups.
For further information on how to add accounts to groups, you can read the article Adding/Removing Account Membership of a Group.