Media composer has two tools to help you through this.
The first is that Media Composer doesn't often take channel groupings (into stereo and surround) from metadata in ingest. In most cases, you have to set it yourself. From the "bin" menu, "modify clip"/"multichannel audio" lets you assign, or re-assign channel gropings in any master clip into stereo and surround sets of various track orders. Remember, this is telling Media Composer what the clip IS, not what you want it to be. If it came in SMPTE order, tell it SMPTE. You can use this to add or override the metadata coming in with your source material.
The second is for cases where you need to export channel groupings from a more complex sequence, and have a variety of source clips with panning information. In this case, use Timeline/Mixdown/Audio/Multiple Mix dialog. This tool will create for you a new sequence, but with audio mixed down into the channel arrangement you need for delivery. For example, if you need to deliver channels 1-6 and a surround set, and 7-8 as a stereo pair, you can set up two mixdowns in the multiple mix tool (and save them for later), and when you use it, it creates a new sequence with all the original video tracks, but with all of the audio mixed down into the requested tracks, fully flattened including master fader AAX effects. If you are starting with material that is pre-mixed or otherwise has dedicated LFE tracks, you will want to read my earlier reply today about the "audioextras" console command and the "allow LFE-only tracks" checkbox.
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