It's quite straightforward in Audition. You have to start with an empty 16-track 'container' first though - this is probably the bit that has eluded you. Go to File>New>Audio File, set the format to be the same as your existing files, and where it gives you a choice of channels, twirl it down and select 'Custom'. This will start you off with two channels, but if you hit the + button (above Cancel) you can add as many channels as you need. Click Okay when you're done, and you'll have an empty container as an open file. Open your other files as well. In the new file container, deselect the channels you don't want to use by clicking on their name icons on the right-hand side of the waveform display (this is the one that says 'toggle channel enable state' followed by the name of it when you hover the mouse over it). So the first eight are green, and the second eight are grey. Now go to your first file and use Ctrl+A to select all of it, followed by Ctrl+C to copy it. Go back to your new container file and with the cursor at the start of it, use Ctrl+V to paste it into the first eight channels. Now swap over the channel enables so that the first eight are greyed out and the second eight are enabled, and green and open the other file you have, and use the same procedure to copy and paste this into the second eight channels. Re-select all the channels back to green. Save the result - you're done. This actually takes longer to explain than it does to do it!
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