• CellGrouping is an option for notebooks that determines how cells in a notebook should be assembled into groups.
• With the default setting CellGroupingAutomatic, cells are automatically grouped in a hierarchical way based on their styles. The hierarchical ordering is specified in the style sheet using the option CellGroupingRules. • With CellGroupingManual, cells must be grouped manually, either by setting up explicit CellGroupData expressions or by using the Cell CellGrouping Group Cells menu command in the front end.
Automatic, cells are automatically grouped in a hierarchical way based on their styles. The hierarchical ordering is specified in the style sheet using the option CellGroupingRules.
CellGrouping 