Nope I need to group by category collections - and get it from REST API, to create in our app some kind of menu with submenus.Just I have about 150 collections - and they are not grouped by similarityFor example:Electronic- Cell phones- TV- Headphone...

For example there is 150 collections - The aim to get these collections in Groups.For example:Electronics - main category- Camera & photo - sub category- Cell phones & accessories - sub category--- Headphones - sub category of sub category- Televisio...