To add and remove rows and columns, use the Modify > Table or column header menu.
Select Modify > Table > Insert Row or Modify > Table > Insert Column.
A row appears above the insertion point or a column appears to the left of the insertion point.
Click the column header menu, and then select Insert Column Left or Insert Column Right.
Click in a cell within the row or column you want to delete, then select Modify > Table > Delete Row, or Modify > Table > Delete Column.
Select a complete row or column, then select Edit > Clear or press Delete.
To add or delete rows, increase or decrease the Rows value.
To add or delete columns, increase or decrease the Cols value.