[James Strecker] “Do I need to do video and audio separately?”
If your version allows you to it, that is the ideal way. If there’s an option for AC-3 audio, that’s the one to select. Make sure to give it the same name as the video file. That way, when you load the video file into Architect Studio, the audio will automatically follow.
I use Vegas Pro and DVD Architect Pro but the steps should be the same so try it and see. Good luck.