Dear Krishna,
I am giving you an example. Suppose there is a Master role z_abc_master and one two derived role z_d_abc and z_d_abc1. According to the requirement in z_d_abc we have maintained some document type 1, 2 and 3 and for z_d_abc1 we have maintained document type 4, 5 and 6. But in master role z_abc_master only 1, 2 and 3 document type is maintained. Now if I change something in Master role and generate it then derived roles will take value of document type 1,2 and 3. 4,5 and 6 will be removed.
Simply I want that changes made in Master role will not overwrite the derived roles, but simply add changes in derived roles.