Ok, This will depend on the authoring software you use, but I’m going to assume you’re using TSmuxer on Windows.
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Download and extract ffmpeg. here
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Copy this text to a new batch (*.bat) file and save it in the “bin” folder where the ffmpeg.exe file is saved.
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Number or label your six wav files in the correct order 1-L, 2-R, 3-C, 4-LFE, 5-SL, and 6-SR, select all six files, then drag & drop them on the batch file you just created. The batch file will make a new output subfolder labeled “51” containing your 5.1 w64 pcm file, which is readable by TS Muxer.