Open "non.mpp"
Open AnotherProject.mpp
Click on Tools > Organizer > Calendars-tab
In the lower left box select "non.mpp"
In the lower right box select AnotherProject.mpp
In the larger box above the place where you selected non.mpp
* click on the calendar you want to copy;
* click on the Copy button.
I'm not a *big* fan of using calendars. Unless your Work and Duration fields are really accurate, you're basically talking about a day or two a month ... that's 5% to 10% of the working month. Are your estimates of Work and Duration that accurate? If they aren't then the effort to track specific holidays, etc., is an exercise with little return on your effort.