With env0's Sub Projects feature you could structure your projects in a way that better depicts your organization's needs allowing you to have better granularity. Now you will be able to edit this hierarchy and granularity with the ability to move projects to a different project or a sub-project.
env0 now allows moving projects and sub-projects to re-structure your project's hierarchy in a way that suits your needs.
In the Project Settings page, you can now find a Move button
Using that button will open a popup allowing you to select which project you want the project to move into
You can read more about this here