Roles cleanup from GRC10.1 system

Hi All,

GRC10.1, SP005

Roles are imported to GRC system through NWBC->role mass maintenance->Role import.

Not using any work flow for BRM.

Roles are assigned to users via access request work flow.

After couple of months 2 roles are deleted from plug-in system( ECC). Now I want to remove these 2 roles from GRC system also.

Please advise on below queries.

1. What is the best method to deleted them? Can I delete from NWBC->Role management->Role maintenance-> search role and hit "Delete" by making sure no assigned users.

2. Is this ok to delete the roles from plug-in system before deleting from the GRC system?