There is a “Table manipulation” section right below table content with merge options. Also, there is the following help file within options:
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Table cells can span across more than one column or row.
Combining consecutive cells within the same row is called “colspanning”. Combining consecutive cells within the same column is called “rowspanning”.
To combine adjacent cells in a row, add the keyword #colspan# to the cell to the right of the one with the content for the combined cell by using the corresponding button. To combine adjacent cells in a column, add the keyword #rowspan# to the cell below the one with the content for the combined cell by using the corresponding button.
Repeat this to add the keyword to all cells that shall be connected.
Note: Be aware that the functions of the DataTables JavaScript library will not work on tables which have combined cells.
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