[amel27]

Код:

@Echo Off

Set ROOT=C:\TEST
Set FILE=lels.txt 

If Not Exist "%ROOT%\%FILE%" Echo.>"%ROOT%\%FILE%"

For /R "%ROOT%" %%i In (%FILE%) Do If Exist "%%i" (
   Copy /B "%ROOT%\%FILE%"+"%%i" "%ROOT%\%FILE%"
)