Few weeks back, we Rahul Tiwary and Prashant Maurya developed a tool named User Profile Migration for moving Users along with their respective BU’s, Security Roles and Teams that they are part of from one instance to another.
Our earlier tool User Security Manager provided feature to update the BU, Security Roles, Team, Field Security Profile of the users(s). However when you change the BU of the user, just like our OOB behaviour of Dynamics CRM, all the security roles get removed.
What if we want to quickly update the BU of the user keeping the same the Security Roles assigned. (We need to make sure the new BU has all the same Security Roles, which ideally would be the case if we have created them at the root Business Unit level )
To do that – we can use User Profile Migration tool.
We can download the user profile (xml format) and only update the Business Unit name there and upload the file back in the tool.
Check the step by step guide here
https://rahultiwarydynamiccrmblogs.wordpress.com/2019/05/14/dynamic-crm-user-profile-migration/
Hope it helps..
Nishant Rana's Weblog 
One thought on “XrmToolBox – Using User Profile Migration tool for quickly updating User’s security roles on changing the Business Unit”