Is there a way to add a drop down menu on an individual product page for the product description. I included 2 screenshots, one from editing the product page and one while editing the online store. I want to include in right where it says “details” in both images. (I’m using the theme Dawn). Also, it has to be editable for each individual product, it can’t be one drop down menu that is the same for every product. 
Yes, you need to create templates for the products you want to make the changes to and then assign it to the templates.
How to create templates – https://help.shopify.com/en/manual/online-store/themes/theme-structure/templates#create-a-new-template
Appreciate the response but I misworded my question. So for the second screenshot where it says “Details” in the product description, I want all the content and words to be the same but I want it to be a dropdown on the first screenshot. If anyone is having trouble understanding what I’m trying to say, don’t be shy to say so. Any help is appreciated, thanks!
Yeah it’s still the same thing. Because you want the detail and subsequent text to be on just a particular product you create a template for it(follow the link I posted earlier) and then do that. Also dawn has drop-down blocks so you can add the text directly in the customizer.