Duplicate Application and automatically update it

Duplicate Application and automatically update it

Well, my question is quite general concerning the duplication of an application. My question is, if I have a huge application and I duplicate it, is there any way when I change something in the 'parent' application then automatically to make this change in the duplicated application? In other words, to update automatically the second application. For example, if I add a new form in the 'parent' application then to automatically create this form in the second application. Or I have to do it manually in every application?