Sure, it’s possible. Look at my website - https://www.east-cosmetics.com/uhod-za-volosami
You can select filters in different sections.
So you need:
- Create one joint collection with ALL products in it
- You already have collections of each type of item
- Create separate collections per each RETAILER (and any other criteria you need, for examples SEASON etc.), you just need to select the products you already have for each collection
- Choose for your Product Gallery joint collection (from 1)
- In options of your Product Gallery go to Filters => create “Custom Filter”, name it “RETAILERS”, you will be offered to choose another collections which included in joint collection => choose all created collections with each RETAILER. That’s it.
You can add here SEASON as well at the same time. One limit I found there - you can use up to 31 collections per one Product Gallery.