Batch - copy file using relative path

if you start your path with \, it's an absolute, not a relative path. Try copy "Debug\text.txt" "..\..\new" instead

if you have Debug subdir try with

md   "..\..\new" >nul 2>&1
copy ".\Debug\text.txt" "..\..\new"

md will create a new directory two levels up if you don't have it already.