Under the 'Groups' option, in the Admin section, is where you organise your styles groups which will appear as a dropdown in the style header. When filtering, you will also be able to filter by group.
1) Groups overview in the Admin section
2) Group filter/selection in the style header
CREATING A GROUP
In the Admin section, select "Groups" from the left side menu to add a group.
1) Click the 'Add group' button and a new table row will appear
2) Type in your group name and click the green small button to save
If for instance, you need to change the group name, simply mouse over the group name or double-click on it. The row will be in edit mode like shown in the picture below. Remember to click the green small icon to save your changes.
You can easily deactivate groups if they should no longer be selectable for new styles. This can be useful after some seasons where the group list has become too long. To do so, select the group you want to deactivate and uncheck the option 'ACTIVE'.