In the Render As window, select MainConcept MPEG 2 in the Save As Type field. Then select the DVD Architect NTSC video stream template in the Template field below the Save As Type field. That will only render the video stream, so you will have to go back to the Render As window to render the audio stream. Select Dolby Digital AC3 in the Save As Type field and Stereo or 5.1 Surround in the Template field (You will only see one of these options, which reflect what your project properties are set to). Also, make sure you render both files with the same name. If you do so, when you import the video stream into DVD Architect, the audio steam will import automatically.