How to add horizontal borders only in specific range in Excel?

Before entering contents into cells, you can add top border and bottom border for the first row in the specific range, and then apply this row's format to other rows with Fill Handle in Excel. And you can do as follows:

1. Select the first row in the specific range where you will add horizontal borders only.

2. Add Top and Bottom border with clicking the arrow besides Border button > Top and Bottom Border on the Home tab.

3. Move mouse to the bottom-right corner of selected row, when the cursor changes to a cross, drag the Fill handle to the rows you want to apply Top and Bottom border.

Then you will see only horizontal borders are added in the specific range in Excel, see below screen shot:

Note: This method works well in a blank range. If there have already been contents in the range, this method will clear original contents and fill with content of first row.

Actually we can customize the border style with horizontal borders only in Excel easily.

1. Select the range you want to add horizontal borders only.

2. Click the arrow besides Border button > More Borders on the Home tab.

3. In the opening Format Cells dialog box, go to the Border tab, and then click to highlight all horizontal borders in the Border section. See below screen shot:

4. Click the OK button to apply this custom border.

Then you will see the custom border with horizontal borders only is added to the selected range at once.