Hi Rama and welcome to the Bali forum. If you have a query about transit in Singapore you'd be best off posting on the Singapore forum, your ultimate destination is irrelevant. And maybe clarify what your question is, is it regarding whether you need a transit visa or how to make the connection....
Thanks for replying. Just I want to know whether I need transit Visa for layover period of 2hr15min. My itenery is on one ticket.
Since your entire journey is on the same ticket and same airline, you will just need to go to the gate for you onward flight. There will be airline staff who will guide you and there is nothing to worry about. You will not need to pass through immigration in Singapore.
Thanks for the reply.