What is the use of join federation in join command used Generative Shape design in CATIA V5
I sent so little picture for understanding, i hope this will help you understand about federation clearly.
i try to upload explanation but i don't know its not visible here..sorry
You can select a entire surface by clicking on just one face (cell). With this command CATIA recognizes only a entire surface. Its usefull for hole features on complex parts. You will not have a error when holes change their position to another cell on the same surface.