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Gets the outline column for the worksheet.
The outline column displays hierarchical row data in a tree view. Use the returned IOutlineColumn object to configure the column index and display options for the row hierarchy.
IOutlineColumn OutlineColumn { get; }
ReadOnly Property OutlineColumn As IOutlineColumn
worksheet.Range["A1:A3"].Value = new object[,] {{"Name"}, {"Node 1"}, {"Node 1.1"}};
worksheet.Range["A2"].IndentLevel = 1;
IOutlineColumn outlineColumn = worksheet.OutlineColumn;
outlineColumn.ColumnIndex = 0;