Answer / raju

Derived role:
-------------
Derived role inherits all properties from Master role.It
mean all authorizations.
If u made any changes in master role it will reflect in
child role but not vice versa.

We can't add any authorizations in derived role.But we can
maintain org levels.

copy role:
---------
copying role means creating a role same as from existing
role.It's name should be changed.

There is no relation between existing role and copied role.

Answer / raghu

We can add authorizations to the derived role . But there will be consistency with parent role and derived role .
And adding authorization in derived role is not efficient . For the better practice always add the authorization in the parent role , if at all you want to add for only particular company code  create new single role and assign 

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