I have created a Google site, in manage site there is option to add Google apps script and I can add multiple Google Apps Script projects that can be embedded in Google Site. Please see below screenshot:
In this image, you can see four projects. Is it possible to add a common project that has common functions used by all four projects? So basically the four projects will make calls to the functions in files of the common project.
I have gone through Google API documentation and can't seem to find anything unless I have missed it.