Is it possible to Edit the "New Project" template?

Mainly dev in C++

I tend to build each of my projects with the same structured layout & similar ways of formatting the CMakeLists etc. 

I don't know if I'm just missing something obvious, but I can't find a way to change the standard template which builds when you ask for a new project. 
For instance, I would want it to automatically build a "src" directory, to place a secondary CMakeLists in this directory, with different contents to that in the main CMakeLists. 

Any help would be greatly appreciated.