To split the cell into rows, select Table > Split Cell > Split Cell into Rows. To split the cell into columns, select Table > Split Cell > Split Cell into Columns.
To split a single cell into three or more cells at a time, select Table > Specify and Split,
and then specify the number and the direction of the split.
To join table cells:
Select the cell range (either vertical or horizontal) that you
would like to join.
Select Table > Join
Selected Cells.
You can also join
cells by selected a single cell and using one of the options in the Table > Join Cell menu.
To return joined cells to their original state:
Note: When
you resplit the cells, the contents of the cells will not return to their
original cell location.
Select the joined cells.
Select either Table > Split
Cell > Split Cell into Rows or Table > Split Cell > Split
Cell into Columns, depending on how the cells were
originally joined.
For more complex cell splitting, you can select Table > Specify and Split and
define the cell splitting more precisely.