How to splitting Mpeg2 files with selectable subs

[iDeFiX]

After encoding from divx to mpeg2 file with VirtualDub and TmpGenc to create a SVCD, I use subadjust - MaestroSBT and Winsubmux to add selectable subtitles to the mpeg2 file.
But how can I split these mpeg2 file without loosing the subtitle streams and or a second audio stream in it?
With tmpgenc Mpeg tool, the extra datastreams disappear after splitting. The meaning for splitting is to put the result on CD-R's with an authoring tool like U-lead's Moviefactory.

Thanks in advance.