How to create multiple hierarchies under same tree name?

Summary: Creating multiple hierarchies under same tree name

Content (please ensure you mask any confidential information): We have build a CVR which is using a parent value that belongs to a different hierarchy(having different tree name). When we tested our CVR, it wasn't working. So ultimately we realized the tree name needs to be assigned at COA structure instance level. Initially our main hierarchy was assigned at COA structure instance level not the CVR hierarchy. But since only one tree name can be assigned at structure instance level, hence we created a different hierarchy version under one tree name under which our main hierarchy version is available and which is assigned at our structure instance