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 - Television & video - sub category
for example resultis :
name - Electronics
id - 2222222
collection id -0
name - Camera & photo
id - 4444444
collection id -2222222
OR
get navigation menu of grouped collections
OR
Group collections and hide it and use it only for API - to get structured collections with the name of Main collection
All options are good - even if its somehow with tags or whatever
Please help me. and if its possible in more details