How can I let department managers approve time?

Welcome to the Community, @edevintx.

I'd be glad to help in letting department managers approve time in QuickBooks.

Here's how:

1. In QuickBooks Time, select Feature Add-ons, then select Manage Add-ons.
2. Go to Approvals, then select Install.
3. In the Approvals Preferences window, on the General tab, make your selections.
4. (Optional) Customize the message team members will see when they submit their timesheets.
5. (Optional) On the Notifications tab, set team member timesheet submission and manager approval reminders.
    

You can also approve time directly in QuickBooks Time: Approve, unapprove, and reject timesheets in QuickBooks Time

In case you want to delete an employee's hours, you can as well use this link as your guide: Add edit and delete employee hours.
 

Let me know if you still have questions about approving time in QBO by leaving a reply below. Take care and have a great rest of the day!