ses-insert-column
ses-insert-column is an interactive compiled Lisp function in `ses.el
'.
(ses-insert-column COUNT &optional COL WIDTH PRINTER)
Insert a new column before COL (default is the current one).
With prefix, insert COUNT columns before current one.
If COL is specified, the new column(s) get the specified WIDTH and PRINTER
(otherwise they're taken from the current column).