How do a split a column into two columns?
To bisect a column, place the cursor in the header area, over the right column boundary of the column you wish to bisect, until the cursor arrow changes to a vertical line with an arrow running through it. Then, hold down the Shift key while holding down the left mouse button and drag the boundary to the left. Releasing the mouse button will place the column boundary in its new location. A drag to the left will bisect a column. A drag to the right will merge the columns.
