To delete the specified borders of a cell/range of cells/table, follow the steps below:
1.Select the desired table or cell or range of cells.
2.On the Home tab, in the Table group, click the arrow to the right of the
button.
3.In the border settings pane that opens:
•In the first block of settings, specify where you want the borders to be deleted.
•In the second block of settings, select No borders.
4.To close the border parameters pane, do one of the following:
•On the Home tab, in the Table group, click the arrow to the right of the
button .
•Click a blank area of the document outside the border settings pane.