Need ability to move and delete Enterprise Account Account Groups

We currently have an Enterprise Account and organize accounts for billing using its hierarchy capabilities via Account Groups.

We can create, move and rename most things but cannot move or delete Account Groups.

This means our Enterprise Account now contains a few "orphaned" Account Groups that we can do nothing with as we automate the creation of the Account Groups during our automated account provisioning process.

There should be some way to delete Account Groups that are no longer needed!