addColumnGroup

adds a column group over the specified range

void addColumnGroup(number|array columnId,string page);

columnId	number\|array	optional, a column ID or a range of column IDs [start, end]
page	string	optional, a page name

$$("ssheet").addColumnGroup();

Details

If the columnId parameter isn't specified, the method adds a group for the selected column(s).

Grouping doesn't work with multiple active zones (multiselect).