You've made some faces using FaceGen Modeller, and now you need to get them into the game you're developing. Integrate your own polygonal mesh and UV layout into FaceGen. Run your new models through the Customizer, and you get a new set of data files that plug into FaceGen Modeller. Now you can load your own mesh into Modeller and apply all your existing faces (stored as FG files) to it. You have all the same face shaping and coloring controls at your command. Your hairstyle and helmet models fit seamlessly with any face.
You can also integrate your torso or body model to generate a seamlessly matching skin color for it. Export your models to your desired format (3DS, LWO, MA, OBJ, VRML97, VRML1 or XSI) and bring them into your authoring pipeline.
Unlike the face shape and colouring controls, the animation morphs supplied with the FaceGen Modeller default models are specific to those meshes. If you want to make use of these on a mesh with a different topology you must copy them over to your topology.