How to Duplicate sections of a map, intact?

Hiya.

Im building a map and has quite a large area as half of the build. It has objects in multiple subfolders , nested under one master folder “section01”.

What is the correct way to get this all into some structure where I can work on it and duplicate transform rotate it into another part of the map, such that any updates I do populate to them.

I guess like a Giant blueprint or asset? But created from the heirarchy I have made in the scene?

If I jsut try to duplicate and move, or duplcate heirarchy, not only does it not retain the heirhcy the snapping pieces freak out.
So ideally I need to build some sort of Storre of the build (Is it blueprint or something? ) that I can then duplicate around my map as needed?

Thanks