We have tried adding/creating private hierarchy based on https://dedalo.dev/docs/management/install_new_hierarchies/#process-to-create-new-hierarchy However, running into strange issues.
For instance in the screenshot attached, no matter how i rename the term for the root level term on1_2 and set it as Toponymic(WHERE) it keeps auto reverting to blank.

Few more screengrabs that might be of relevance to this issue:
Terms:

Models:

Could you kindly provide us with a stepwise direction on how to add private terms and models at root level. Our goal here is to make a root level heirarchy Toponymic(WHERE) within the Thematic category at top. Also how to establish properly link between the terms and models. Our hit and trial approach has caused many stray terms and tlds and creating massive confusion. Trying to delete those test terms is also not working, the trash bin icon is clickable but does not do anything and the empty term tld can still be seen at root level.
Please feel free to let me know if my definition of the issue seemed vague or unclear.
We have a scheduled virtual meeting with Gerrard tomorrow, if possible conveying the solution via him would also be much appreciated if possible. But we'd love to try out any recommended suggestion from your side over here prior to the virual meeting.