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

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

Cell > Merge Cells (Mathematica Menu Item)

Merge Cells combines selected cells into one cell.

Insert > Object... (Mathematica Menu Item)

Object opens a dialog to insert an embedded object, such as a bitmap image, spreadsheet, or document file, at the insertion point (Windows only).

Edit > Paste (Mathematica Menu Item)

Paste inserts the current contents of the clipboard at the insertion point.

Insert > Picture (Mathematica Menu Item)

Picture inserts a picture from a file or inserts an empty graphic at the insertion point.

File > Print Selection... (Mathematica Menu Item)

Print Selection prints a selection.

File > Revert… (Mathematica Menu Item)

Revert restores the current notebook to its last saved version.

Insert > Special Character… (Mathematica Menu Item)

Special Character opens the Special Characters palette.

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

Split Spanning divides a spanning entry from a formatted grid into separate entries.

Window > Tile Windows Tall (Mathematica Menu Item)

Tile Windows Tall arranges all windows to fit in the screen one beside the other (Windows and Macintosh only).