Combine multi-audio ismc, ism files

Question

Hi all, 

Currently, I have

transcoded video(no audio) *.ism, *.ismc, *.ismv files for a movie clip;

transcoded audio(english) *.ism, *.ismc, *.ismv files for a movie clip;

transcoded audio(japanese) *.ism, *.ismc, *.ismv files for a movie clip;

How do I modify the ism, ismc, ismv files so that I have 1 streaming video file with multiple audios included?

Thanks.