How can I achieve this on a collection page?

Hi all,

Ive looked but can’t seem to find an answer to the question - I was looking at a website today and saw on their collection page they had images and links to other related collections to create a sort of ‘master category, sub-category type of thing’ which I thought could be useful especially because all of the items in the ‘master category’ displayed below the sub-category links

heres a link to said website https://www.naturalbabyshower.co.uk/collections/feeding-weaning

I was wondering if this is a setting on Shopify I can utilise on my own store or if it’s coding they have wrote to alter their theme?

any help much appreciated

Andy