Hi Francesco,
Ok, here goes.
1. You will need to duplicate the call-to-action.php file located in /sections/ directory.
2. In options.php located in the /inc/ directory you will need to make several changes.
a) Add a line for the new section on line 629
b) Duplicate code section from line 1973-2129. Make sure you rename all the ID’s for the new call to action section.