Linking to a category?

Now that I’ve started to create a few products, I’m encountering an unforeseen problem.

From the advice given by Andy in a previous post (here), I understand I can create a “category” link that shows up in the menu. But what if I don’t want the link to show up in the menu? What if I instead what to create a link within a page to a specific category of products?

To understand, please refer to this page on my site: https://catherinerondeau.com/tirages-art-photographie/

At the bottom, you have three options, for small, medium and large prints.

I want to create the ‘illusion’ of separate shops for the small & medium print options. (I don’t want a shop for the Large)

I can use the link under medium “BUY IN THE WEBSHOP” to reach my main shop (which I’ve done, though things are still unfinished there).

But how could I make the link under Small prints target a specific category of products? (as it is the link goes to another printing site, but I want to change that to a specific shop page on my site).

Any ideas anyone?