Transparency for objects with multiple elements (Alpha-Settings)

So, i have this animated Symbol, constructed with different animated elements on different layers. Now I want to make it transparent, but instead of keeping the look of the whole symbol and making it transparent as a whole, the program makes each element transparent.

With the render-as-bitmap-option I get what I want, but it isn't animated anymore.

I'm currently planning of surpassing this by creating an extra-symbol for each single frame of the animation, but I'm wondering if there's no easier way to do this?