Hi everyone, is it possible to add non-inventory items to a SC site?

Yes

Do you happen to have a link to a guide on how to do so?

... I'm not sure why would you need one? Set one up and mark it available for web store and it should show? Or have you encountered a specific problem?

I think I got it. I had the items added to the site but they weren’t showing due to PCV settings

Yeah peeseevee will do that. Glad it's sorted