How to create reports from approvals from the timesheets submitted by team members.

I manage a team and use MS Project Online to handle our timesheet submissions and approvals. I've been encountering challenges with creating comprehensive reports that include additional data such as admin time, sick time, and vacation time. These data are submitted in the timesheets and I can view them if I delegate as the team member. I can also view when prior to approving the timesheets. However, once approved, when I go back to pull up timesheets, I see total hours only and not the unbillable hours like admin time and PTOs. There are unbillable column but they show zero hours. I would like to either add columns in the approvals or see a way to pull timesheets in bulk. Please advise or let me know if you need additional information. Thank you!