Drag a clip into an S track (Superimpose track). This track will play on top of overlapping clips that are in Video Track A or B.
Step3
Click the clip in the S track to select it.
Step4
From the Clip menu, click on Transparency. A dialog box appears.
Step5
Click on the Key Type pop-up menu and select a key type. (A key is a method of setting the transparency. Because the Superimpose track will go over the A or B tracks, you need to specify how transparent the Superimpose track will be.)
Step6
Move to the Sample box to preview your clip based on the transparency settings you picked. Drag the slider to see other frames in a sequence.
Step7
Make additional adjustments to the transparency from the lower half of the dialog box. The options available to you depend on the key setting you chose.
Step8
When you are satisfied with all the settings, click OK.
Step9
Preview your work.
Step10
Save the project.
Tips & Warnings
You can adjust a superimposed clip's opacity so that it will "fade out" or "fade in" gradually. Use the Fade Control line at the bottom of the Superimpose track. When your pointer is over a control line, the pointer turns into a hand. Click to create a line, and then drag your line up or down to create the fade out or fade in.