Thanks for a quick reply. But how I can cutover 1 application at a time when BuildServer and Deploy Server are shared by other applications. I think, I have to go with Agent with Instance ID. Is it possible to jump on quick call, so I can share my setup.

We are currently using BM Version 5.7.0(Build 8) and utilizing legacy features too. We are using MS SQL database. I have 100+ Applications and numerous build/deploy servers using old agent. I can't just upgrade it without testing most of the applications. What is the best way to approach it.