stuartmiles on "making function and template changes"

I got some custom work done on my zen website and it keeps replacing the new files with the originals.

Now, I realise afterwards that I should have told the person not to adjust any files within the zp-core folder but now, even if I put the files outside the zp-core folder and even rename and put them in in subfolders it will still delete or replace them.

So my question is how to make template changes and add functions the correct way so the system won't replace them or, if necessary, how do I turn the replacing off.

Thanks :-)