I guess i explain what i need in the title but if not i want to make something like this.
You can use the Windows command line (DOS or
copy /b 00001.mts+00001.mts K:\Merged.mts as explained in this step-by-step tutorial, where in your case
00001.mts is the identical file repeated over and over again:
Connecting the same file 6 times instead of twice, you would just replace in