Click inside a table cell.
From the Table menu, select Insert Column. The column is inserted in the table. Existing cells are shifted to the right of the new column.
Tips:
If you highlight multiple columns and then select Insert Column, the number of columns that are highlighted are inserted.
The right-click menu contains the most common commands for working with tables. Click inside the table to access these options.
You can turn table gridlines on and off by clicking Table Gridlines on the toolbar.