Help System (web edition)

INSERT L1,L2
inserts an empty column on lines L1-L2 in the position indicated by the
cursor.

INSERT L1,L2,C
inserts C empty columns on lines L1-L2 in the position indicated by the
cursor.
In both forms of INSERT:
If L1 and L2 are omitted, the next chapter up to an empty line will be
processed.