"Deployments" in itopia integrate with "Projects" in Google. As such, Google logically separates the deployments by Projects.
You can think of a project as the organizing entity for the environment you are building in Google Cloud. It will include the VM instances, resources, settings and permissions in a separate internal network.
You can have several deployments in itopia and for every deployment in itopia you will have a separate integrated project in Google.
The resources that each project contains remain separate from the rest of your projects. The only way of interconnecting projects is through an external network connection.