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MATHEMATICA GUIDE
Controlling Cell Grouping
Typical stylesheets make Mathematica automatically organize notebook cells into convenient groups. You can override this behavior, or control it in any way, using menu items, option settings, or from within a program.
Reference
Menu Items
Group Cells (Ctrl+G) — group together selected cells
Ungroup Cells (Ctrl+U) — ungroup selected cells
Cell ► Grouping ► Manual Grouping — switch off automatic cell grouping
Grouping Options
CellGrouping — whether to do automatic grouping of cells in a notebook
CellGroupingRules — precedence and grouping type for cells
ShowGroupOpener — whether to control cell groups with 
CellGroup — symbolic representation of a cell group within a notebook expression
