Select Editor

Select the Editor you want to create the grouping around.
Popup Menu

Right click the Editor and select the Group menu item.
Change Group Name

One the group appears, select the group, right click and select the Rename menu item.
Enter Group Name

Type in the new group name and click the enter key.
Add More Editors

You can add more editors to the group by dragging and dropping them inside the group.
Finished Group

Using groups is a great way to break up functionality and makes it easier for your end user to navigate your software.