This function allows you to organize and personalize calendars in your own way.
1. Click 
at the right of the Calendars pane, then select Add Group from the drop-down menu.
2. Enter the group name, and its description in the respective fields.
3. Click Save to finish.
After creating a new calendar group, the created group will be displayed in the Groups table of the
Calendar Groups
form, so you can easily edit or remove groups from this list by clicking 
or 
respectively.
Note
After you have created a Space for a group, one calendar with the same name as that of your group will be created automatically in the Group Calendars pane.
The calendar group without any calendars inside it will not be displayed in Personal Calendars.
You can also add a new calendar group by clicking 
next to the Group field when creating a personal calendar.