code: public void setCellMergeInAllTables(final int rowIndex, final int colIndex,
  			final int rowMerge, final int columnMerge) throws FastOdsException, IOException {
  		for (final Table table : this.odsDocument.getTables()) {
  			this.tableHelper.setCellMerge(table, rowIndex, colIndex, rowMerge,
  					columnMerge);
  		}
  	}
docs: Set the merging of multiple cells to one cell.
  
  @param rowIndex
  The row, 0 is the first row
  @param colIndex
  The column, 0 is the first column
  @param rowMerge the number of rows to merge
  @param columnMerge the number of columns to merge
  @throws FastOdsException if the rowIndex or the colIndex is negative
  @throws IOException if the cells can't be merged