Masking is a generic term appplied to what we might do by applying an adjustment layer. However Bezier Masking and the compositing Track Masking options aren\’t the same. BM allows us to cutaway, crop asymmetrical shapes from an Event. TM allows us to alter the actual appearance or pixels AND in reference to the layers below. The only thing these two functions, controls share is the word Masking.
Ok, if iwas doing this I would experoment with using the ability that Vegas has to import a whole Vegas project into another Vegas project – it then gets treated as a pure
piece of media which you can THEN apply your BM straight off.
You could also try Copy>Paste Event Attributes, but you may find it too restrictive.
Grazie