Create Tree View

Hi All,

Am very new to development and especially to erpnext. I need help in creating a tree view.
The structure is as follows:

Project Name (already created a new doctype since it is for a custom app)
—Wing Name (this needs to be optional)
------Floor Name (again optional)
---------Unit No.

I need to be able to upload / attach wing wise, floor wise or Unit No wise plans.

Lastly, require option to create / import the required structure in bulk.