There are several ways to make folder structures in the documents section.
Depending on your type of project different document structures might work better for you than others.

In this document structure you structure your files after what type of document it is.
All floorplans go in the floorplans folder, all meeting summaries go in the summaries folder etc.

This file structure is more suited towards smaller projects where a smaller team is working together to produce a set of drawings

An example of this type of document structure can be:

001_Admin

002_Photos-and-presentations

001_Presentations

YYMMDD_Presentation-title.ppt

002_Site-visits

YYMMDD_Site-visit-title.jpg

003_Drawings

001_2D

001_Plan

001_Floor

001_DWG

YYMMDD_Drawing-title.dwg

002_PDF

002_Ceiling

002_Fire-escape

002_Section

002_3D

001_Models

001_Archicad

001_PLN

002_IFC

YYMMDD_Drawing-title.ifc

002_Navisworks

003_Revit

001_RVT

002_IFC

004_Rhinoceros

005_Solibri

006_Point-clouds

002_Visualization

001_Renderings

002_High-resolution-images

004_Contracts

In this document structure you first separate out the different fields of study that participate in your project.

This type of folder structure can be good if you want to give your users full access to their own are where they are free to move files around as they wish.
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​Example of file structure

001_Admin

002_Field-of-study

001_ARC

001_2D

002_3D

001_Archicad

001_PLN

002_IFC

YYMMDD_Drawing-title.ifc

002_Navisworks

003_Revit

001_RVT

002_IFC

004_Rhinoceros

005_Solibri

006_Point-clouds

003_Contracts

002_ELE

001_2D

002_3D

003_Contracts

003_MEP

004_STR

With models as documents enabled it is possible to connect models from the models section with documents in the documents section.

If new models are made in the models section they will appear in a folder called the models folder. Models can be moved out of the models folder and moved to where you want them to be in the document structure.

Similar to the above examples you can either structure your models by type:
001_Models -> 001_ARC -> YYMMDD_Model-title.ifc

Or you can structure your models by field of study:

001_Field-of-study -> 001_ARC -> 001_Models -> YYMMDD_Model-title.ifc

The best option to choose here depends on if you think your users will be using the models filter. If you separate models per field of study it might be hard for users to find the 3D models that are mixed in with the other documents of each field of study.

If you are confident your users will find the models filter you can use this option.

If you do not believe your users will use this filter it is better to have all your models in their own models folder so that the user is aware that this folder contains models that can be opened in 3D.