Oh_Mell

I am currently setting up a store with Squarespace and I am fairly new to it (more familiar with Shopify). I am using the theme "crosby" version 7.1. I have set up all the products with the collections being put into the "categories" tag. I have got all my collections displaying correctly however I would like to add a custom banner too each collection page and ideally a block of images at the bottom. At the moment I can only add one which appears across all pages and from searching it seems you can only custom code it to get around this is that correct? I have attached an example to show what I mean. Thanks!