What is cbo in cdsl?

I have registered for CDSL EASI and should I upgrade "BOID to EASIEST?. - It is a facility provided by CDSL wherein a BO can group additional demat accounts to his/her 'easi/easiest' login and view the holdings as well as transaction details of the grouped accounts using a single login. Currently, Login from this page is available for BO/CBO/CM/DP and Issuer users. What is CDSL easi and how do I register? 'CDSL easi' is a portal by CDSL ( Central Depository Services) where you can view and keep track of your. The BO ID can be found here.