Add another one <tr>after the current c colspan, which covers all the columns, and then places another <td>c in it <table>.
<tr>
<td>col1</td>
<td>col2</td>
<td>col3</td>
</tr>
<tr>
<td colspan="3">
<table>...</table>
</td>
</tr>
<tr>
<td>col1</td>
<td>col2</td>
<td>col3</td>
</tr>
A new table will appear between the rows.
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