You can add rows to your table for additional data or labels.

To add a table row

Click a table to reveal the adorners.
Hold your pointer to the left of any row to reveal the row adorner.
Click the arrow button in the center to reveal the row menu.
Select Add Row Above or Add Row Below to add a new row in the indicated position. The newly added row is of the same type as the selected row.

Alternate method

You can also add a row above by clicking the up arrow button in the row adorner.
You can add a row below by clicking the down arrow.