How the user id will be created in IDM , I mean the logic how the user id is created using first name & last name . Is there any document available for the same .

If you check on the Person table you will find a template on the CentralAccount column, that template is responsible for generating the initial user id. This behavior can ofcourse be overwritten if you want.

Thanks aravagg . I checked in the template contains VB code to generate the inital user ID . But i am unable to understand it , is there any way that we can understand the logic in plain language format in IDM .