How to add new Organization to the existing Org Tree

Summary:

We are adding a new entity to our system and want to add this new entity to our Recruiting Org Tree.

Content (required):

We are adding a new entity to our system and want to add this new entity to our Recruiting Org Tree. When trying to add the new entity we are getting the following error message:

"Multiple root Node is not allowed for this tree structure"

Version (include the version you are using, if applicable):

23C

Code Snippet (add any code snippets that support your topic, if applicable):