The Cell menu provides items that manipulate or transform entire cells.

Convert To ▶ — convert the selection to StandardForm, TraditionalForm, etc.

Cell Properties ▶ — toggle cell properties (Open, Editable, Evaluatable, ...)

Cell Tags ▶ — display, edit, and search for cell tags

Grouping ▶ — control cell grouping and toggle cells open or closed

Divide Cell — split a cell at the insertion point

Merge Cells — combine the selected cells into one cell

Notebook History... — summarize the editing history of a notebook

Delete All Output — delete all output cells in a notebook

Show Expression — toggle the cell to underlying symbolic expression form