You can include elements
            from multiple video tracks in an edit sync group. The following
            illustration shows a multitrack that includes front and matte elements
            for two layers and a background. Create an edit sync group for both
            layers so that any edit you perform to a front, for example, does
            not throw off the timing of the corresponding matte. By creating
            an edit sync group for V1, V2, V3, and V4, you maintain the timing for
            the front and matte layers while working on the timeline.
         
         If you are manually creating
            edit sync groups, the first element you select becomes the master
            sync element. If the edit sync groups were created automatically
            during input, the element used as the master sync element depends
            on the assignment of Primary and Secondary video tracks:
         
         
            - If a track to be included in the edit
               sync group is assigned as the Primary video track, the first element
               on the Primary video track automatically becomes the master sync
               element for the edit sync group.
            
- If a track to be included in the edit
               sync group is assigned as the Secondary video track, and no other
               track is assigned as the Primary video track, the first element
               on the Secondary video track automatically becomes the master sync
               element.
            
- If no tracks to be included in the edit
               sync group are assigned as either Primary or Secondary video tracks,
               the first element on the highest video track in the stack becomes
               the master sync element.
            
To create an edit sync group with multiple
            video tracks:
         
         
            - Select
               and enable Edit Sync in the Menu Priority box.
            
- Select the element you want to use as
               the master sync element.
            
- Hold down Ctrl and
               click the other video elements that you want to include in the sync
               group.
            
- Click Create.
               The sync group is created.