Custom Code for Dropdown Menu for Index Pages

Site URL: https://www.skylarlibertyrose.com

Hello. I'm using the Sofia Rey template (Brine) 7.0. I'd like to add a couple of Index Pages to a folder that would be visible in a dropdown menu. Ideally I want to keep the index pages as they are (rather than convert them to a regular page) as they're sales pages and are easier to update as an Index. I only use one piece of custom code on my site which is to hide the site title on certain pages. So I'm trying to figure out what code I can use to help with this that won't interfere with anything else on the site. Any help would be much appreciated.