I use movie studio platinum 12.

I want to render text overlay with an alpha channel with audio. As an example I want the text 'car' to come up as the audio plays the voice saying 'car'. I then want to apply different text overlay+voice to mutliple videos. 

So far I have rendered every text overlay and voice but can't seem to find a way to keep the alpha settings. I am currently having to right click each text overlay and change its alpha channel. Which is taking a long time.

Does anyone have any advice? Or if this is not doable - does anyone know of another video editing software that would be able to do it?

Thanks in advance,

Kate