Facebook android manifest.xml problem

I find that i have some question in facebook androidmanifest.xml i use some of the plugins and those androidmanifest.xml is inside the assets>plugins>android, all i need to do is group those xml file to one xml file, but facebook androidmanifest.xml is inside assets>plugins>android>facebook, i grouped it to my androidmanifest.xml inside assets>plugins>android and it also not work, i know that only one androidmanifest.xml should be used, how can i group that together or how can i set the facebook's xml back to assets>plugins>android? Thank you