CellGrouping

is a notebook option that specifies how cells in the notebook should be assembled into groups.

Details

The default setting is typically CellGrouping->Automatic.
With CellGrouping->Automatic, cells are automatically grouped in a hierarchical way based on their styles.
With CellGrouping->Manual, cells must be grouped manually, either by setting up explicit CellGroupData expressions, or by using the Group Cells menu item in the notebook front end.

Create a notebook with automatic cell grouping:

Wolfram Language code: nb = CreateDocument[{TextCell["heading", "Section"], TextCell["text", "Text"]}, CellGrouping -> Automatic];

Create a notebook with manual cell grouping:

Wolfram Language code:

nb = CreateDocument[{TextCell["heading", "Section"], CellGroup[{TextCell["text 1", "Text"], TextCell["text 2", "Text"]}]}, CellGrouping -> Manual];

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