In this report, you will see employees' job roles and you will need to manually unassign them from the respective role. After unassigning, the job role can be deleted.
To create a query on this:
Click Access Button
then click HR Admin.
On the Queries tab, click the + plus icon.
In the right hand-side section, select Job Role.
Click Next then click on Job Role.
Select the job roles that need deleted then click Next.
Name the query then click Next.