Michele - I'm not for sure that Practice Fusion & Office Ally are the same company. Are you thinking about Practice Mate?
Practice Fusion is only an EMR. It doesn't have the ability to handle the billing functions. You can print out superbills, export to another system, or it integrates with Kareo - a web based system.
I have become a certified consultant for Practice Fusion and have been very pleased with their performance and features.