Welcome! Regarding your queries: If you want to change your previous approved financial aid from IT to Project Management means unfortunately cannot transfer or change Financial Aid or a Scholarship across different courses. So, you should apply financial aid for Google Project Management course separately. Go to Project Management course main page and apply financial aid for it. Yes, you can submit financial aid application for all courses in the Project Management course. Additionally, you can submit up to 10 financial aid applications simultaneously.
However, once you have reached the maximum of 10 applications, you will not be able to apply for financial aid for any additional courses until at least one of your applications is fully approved. Once your financial aid is approved again you can submit applications for any course there is no limit.
Hope helps you.
Good luck!