This is documentation for Mathematica 7, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.1)
Mathematica Menu Item

Insert Table/Matrix

Table/Matrix
menu commands for creating and editing tables and matrices.
Newcreate a new table or matrix
Add Rowadd a row to a table or matrix
Add Columnadd a column to a table or matrix
Make Spanningcombine single elements into a single spanning entry
Split Spanningdivide a spanning entry into separate entries