I am currently attempting to render a project to be burned on Blu-ray. My colleague renders files as MPEG-2 and then adds audio through the custom options. (He is running Vegas Pro)

However, I am using Movie Studio Platinum 9.0b. When I select MPEG-2 I am unable to access the custom button.

What settings should I be rendering to get an MPEG-2 file with audio for Blu-ray? (I know they render as seperate files)

Thank you in advance.