Creating a ShotGrid site from a pre-existing Project

Hello All,
I’ve just begun a new project and have been tasked with researching how to create a ShotGrid site from a pre-existing Project. I was told by a few members of my team that this is possible, but that I’ll need ShotGrid Support to “bridge” the 2 sites. Does anyone have any experience or insight into this? Any help or direction is greatly appreciated. Thanks for your time!