Select Item under Sliders.
Click the right mouse button.
Select Add from the popup menu.
The Add Methods dialog box opens.
Enter a name for the series in the Value column.
Select a Slider Type. The default is apSliderVertical.
A next number up from the number of existing series appears under Item.
You had one slider. You add a second. The first slider appears in the list under Item as 0. The second will be listed as 1.
Expand the new slider and configure it using the same steps you used for the previous slider.
Design a slider.