How to Leverage an Offer fo get your Dream Job

Hi everyone I know this is a super widely discussed topic and a lot of people have posted X group vs Y group vs Z location internship offers to ask everyone which is better.

I’m curious on how to leverage an offer (nitty gritty) details on how to send that initial email (to HR or alum) if you networked previously at the bank or if you haven’t networked and it’s a cold email to get a future offer, how to frame it in your words that you are seeking another opportunity and have a offer at hand to the person you’re emailing?

Any information would be so great and I appreciate the help. I just received two offers but interning at one of my favorite banks on the street just in a different role currently and would like to lateral to IB if possible but don’t know how to bring it up. I also have been looking at IB roles at firms next door in addition to my current offers that I would like to be at more / would consider too. How do I go about this?