How to organize a large number of fields

Hello community!

We have to add a very large product catalogue of a bank in Marketo. This catalogue works accross four levels: 

1- Line 

2- Group 

3- Product 

4- Type of product

We would like to organize it in a folder structure in which line (1) and group (2) are folders and product (3) / type of product (4) are the fields that will help us filter in the Smart List. 

Is there any way we could organize the fields this way, creating to folders like the current default marketo folders such as "info" or "opportunity info"? 

Using windows, I've created an example structure of what we would ideally like to see in Marketo field management section:

Thank you!!!