Palettes > Generate Palette from ... (Mathematica Menu Item)

Generate Palette from Selection converts a selection into a palette.

Cell > Convert To > InputForm Display (Mathematica Menu Item)

InputForm Display displays the selection in Mathematica InputForm without interpreting it.

Graphics > New Graphic (Mathematica Menu Item)

New Graphic inserts an empty graphics cell at the insertion point.

File > Install... (Mathematica Menu Item)

Install opens a dialog to install a chosen Mathematica palette, stylesheet, package, or other item in the correct location.

Palettes > Install Palette... (Mathematica Menu Item)

Install Palette opens a dialog to install a palette notebook in the correct location in the Mathematica layout.

Help > Internet Connectivity (Mathematica Menu Item)

Internet Connectivity opens the Internet Connectivity tab in the Preferences dialog.

Insert > Table/Matrix > Make Spanning (Mathematica Menu Item)

Make Spanning combines the selected entries from a formatted grid into a single spanning entry.

Cell > Grouping > Manual Grouping (Mathematica Menu Item)

Manual Grouping turns on manual grouping to allow cell grouping by hand.

Window > Messages (Mathematica Menu Item)

Messages displays the Messages notebook.

File > New > Notebook (Mathematica Menu Item)

Notebook creates a new notebook.