mkv question... many mkv files (with subs) into 1 mkv?

[0okami]

Hey, i was wondering if its possible to merge many files into 1 file with subtitles...

So lets say i have 3 video promos of something and each has their subtitles:
cm1.mkv
cm2.mkv
cm3.mkv

And I want to make those three into:
2009_winter_trilogy_previews.mkv

How can that be done? even if it has subs or multi track audio? Id love to keep the files seperate within the mkv and have them selectable..
Im really new and im not too familiar with the lingo to even to a proper search so any help is appreciated greatly.

I have mkvmerge so far ...

[creamyhorror]

If you combine them into one file, the best you can do is put in chapter markers so you can select the segment you want to play.

Use the Append function in MKVMergui GUI to combine the files.