Org's products have over 60 attributes that are classed into categories. Defining product attributes is a complex task in this case. 

Adding grouping by categories is deemed to improve the task as they build a table of contents for each product to be filled with attributes. 

This is an odoo online solution with studio. We have tried view in the studio to add group by category. But category_id is nowhere to be found. 

Ideally we want to achieve the view as below in search attribute window.

We would appreciate any advice guidance on the issue