You can delete a role at any time if the role is not in use and you have the approriate permissions.
The delete an existing role:
1.Open Application Security from the Desktop.
2.Select the Roles tab.
The Roles|Search page appears.
3.Search for and select the role that you want to work with.
The Roles|Basic page appears.
4.Select 'Delete' from the 'More Options' menu (⋮)
A window prompts you to confirm the deletion of the role.
5.Click 'OK'.
A window confirms that the role was deleted.
6.Click 'OK'.