Merging collections

Hey,I want to merge my 2 collections, for example - I have an colleciton named - “short necklace” and another one is “Long necklace”. And it’s very time consuming to select products and add them to another collections,

so I was wondering if there’s any way to merge all products from 2 collections into single collection instead of adding them manually

If you select Automated for the Collection tyre you can add products that match a specific product tag, or target the word ‘necklace’ in the product title.

I don’t believe there is a way to simply combine multiple pre-existing categories unfortunately.

Hope this helps