Gotcha..!
I did visit the TestDrive one, I kinda got the Gist, but I was trying to set up the Server and Agent configuration and see if we would face any challenge with running the Pipelines on four different clusters with having connection to both Lower Gitlab and Upper Gitlab as we have separate instances for them respectively.
I might have to explore more on the TestDrive, When I tried to initiate a demo pipeline, it ran some Stages fine, one was stuck on finding agent, I was having hard time finding how to assign a new agent which could be an EC2. Anyway..! Will study more.
Thank you so much for the response.
Gowtham