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For QMarkupTable, add a row whose TD spans all the columns:
<q-markup-table>
<thead>
<tr>
<th>№</th>
<th>Name</th>
<th>Code</th>
<th>Diff</th>
</tr>
</thead>
<tbody>
<tr class="bg-primary text-white">
<td colspan="4">Medicines</td>
</tr>
<tr>
<td>1</td>
<td>Mukosolvan</td>
<td>101492</td>
<td class="text-negative">1</td>
</tr>
</tbody>
</q-markup-table>
QMarkupTable is a regular HTML table – it just applies the proper styling on it, everything else is the same HTML you’ve been studying as a student.
Source:stackexchange.com