Cut, copy and paste operations are supported on columns (rectangular areas of text), as well as on ordinary regions.
To mark a column, put the caret at one corner of the desired area and control shift left click with the mouse at the opposite corner. If things go well, the column will be highlighted appropriately.
Once a column is marked, the commands copyRegion, mapped by default to Ctrl C, killRegion, mapped by default to Ctrl X, and delete, mapped by default to Delete, act on the marked column.
The contents of the last column to be copied or killed are saved, and can subsequently be retrieved with the command pasteColumn.
Copied or killed columns are not stored in the kill ring, so cyclePaste cannot be used with columns.