Is it possible to create a custom component to modify the roles ?

Abhilasha - You can create a custom component which will only be access by admins by adding the following code:

<#assign isAdmin = false />
<#list restadmin("/users/id/${user.id?c}/roles").roles.role as mainrole>
<#if mainrole.name?? && (mainrole.name == "Administrator")>
<#assign isAdmin = true />
<#break>
</#if>
</#list>

<#if isAdmin>

.....................YOUR CODE HERE......................

</#if>

To add the roles to users, you need to use API in your code:

 https://community.khoros.com/t5/Developer-Documentation/bd-p/dev-doc-portal?section=commv1&leaf-id=Role.users.add#Role.users.add

Please let me know if this helps.

Thanks!

From the looks of it , you can't here is what you can do to different update a user and also different entities, https://community.khoros.com/t5/Developer-Documentation/bd-p/dev-doc-portal?section=commv2&collection=users#action-update