Select the shape or shapes you want to make transparent.
On the FormatShape toolbar, click the Transparency button .
Note: To display the Format Shape toolbar, on the View menu, point to Toolbars and click Format Shape.
Set the Shape Transparency slider to the percentage of transparency you want.
Note: You can also make shapes transparent by setting transparency for individual shape attributes in the Text, Fill (for closed shapes only), Line, and Shadow dialog boxes.